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Showing posts with label P Way. Show all posts
Showing posts with label P Way. Show all posts

P WAY - विद्युत कृत क्षेत्र में अनुरक्षण कार्यों के दौरान सावधानियाँ

विद्युतीकृत क्षेत्र में अनुरक्षण

विद्युतीकृत क्षेत्र में अनुरक्षण कार्यों के दौरान निम्न सावधानियाँ लेनी चाहिये-

* इंजिनियरींग कर्मचारी को विद्युतीकृत क्षेत्र के कार्य करने के नियमो की जानकारी होनी चाहिये।

* ट्रेन के 250 मीटर दूर होने पर ट्रैक से हट जाना चाहिये ।

* खतरा क्षेत्र में कोई भी कार्य नही करना चाहिये। अर्थात कार्य की अनुमति की स्वीकृति किये बिना सजीव हिस्से के 2 मीटर के अंदर कार्य नही करना चाहिये।

* पेड तथा उसकी शाखाओ को सजीव तार से कम से कम चार मीटर दूर होना चाहिये। उन्हें नियमित रुप से कट या ट्रिम करना चाहिये ।

Examination of Rails

Rails should be inspected for flaws specially, when the rails show signs of fatigue and the rail wear is excessive. The detection of rail flaws is done either by visual examination of the rail or by ultrasonic rail flaw detection.

1.Visual examination of Rails –

Most of the rail flaws develop at the rail ends. Rail ends should be examined for cracks during the lubrication of rail joints by cleaning the surface of the rail by wire brushes and using a magnifying glass. A small mirror is of assistance in examining the underside of rails. Such an inspection on the important girder bridges and their approaches should be done twice a year.

2.Ultrasonic testing of rails–

कांक्रिट स्‍लीपर के फायदे और कांक्रिट स्‍लीपर मेँ कमियाँ


 

कांक्रिट स्‍लीपर के फायदे -

1. कांक्रिट स्‍लीपर अधिक स्थायित्व रखता है।

2. कांक्रिट स्‍लीपर का लंबे समय के लिए ट्रेक ज्योटरी अनुरक्षित रहता है, इस प्रकार यह किफायती है

रेल के टूटने / वेल्डींग फेल हो जाने के मामले में कि जाने वाली कार्यवाही


 रेल के टूटने / वेल्डींग फेल हो जाने के मामले में  कि  जाने वाली  कार्यवाही  : 


(1) यह अत्यंत महत्वपूर्ण  है कि जब कभी किसी रेल  वेल्ड किये हुए जोड़ में टूटन दखाई दे तो रेलपथ को यदि  आवश्यक हो तो प्रतिबंधित गति  के साथ ट्रेन प्रचालित  करने के लिए अविलम्ब कार्यवाही  की जानी चाहिए । 

(2) मेट, चाबी वाला या  गैंगमेन को चाहिए कि  रेल की  टूट-फूट या वेल्ड फेल  होने को देखते ही  सर्वप्रथम  रेलपथ की  सुरक्षा  करे जब तक की  मरम्मत न हो जाए । उसे चाहिए की निकटतम स्टेशन मैनेजर को सूचना भेज दे।  

Guideline Related Issues related with Safety of Track by Member Infrastructure, Railway Board

In order to ensure safety and reliability of assets, regular maintenance of infrastructure is very important. Time-tested system for maintenance of track already exists on the railways. However, to emphasize safety during day-to-day working and while carrying out special renewal works, following instructions are reiterated for strict compliance:

1. Field officials who have been provided for maintenance activities must be utilized mainly for maintenance activities. Also, it must be ensured that they spend maximum time on maintenance and works sites.

 2. JEs / SSEs are having knowledge about the shortcomings and the strengths of the assets under their jurisdiction. Sectional DENs and ADENs should speak to them and make out a comprehensive list of deficiencies with inputs from TMS and such interactions, with target dates required to improve safety. Each Zonal Railway should have such division-wise list with PCE for monitoring the compliance. Summary of the items requiring compliance and action taken should also be advised to Railway Board, on weekly basis.

Short Note On Degree of Saturation

Degree of saturation 

The ratio of volume of water in a given soil mass to the volume of voids is called degree of saturation. It is denoted by ‘S’ and is expressed as a percentage. Therefore, it is also known as percentage of saturation. S= (Vw /Vv)* 100

(i) Dry, if ‘ S ‘ is zero percent 
(ii) Fully saturated, if ‘ S ‘ is 100 percent 
(iii) Partially saturated, if ‘S ‘is between 0 and 100 %.

Soil Classification (Degree of Saturation)








Short note on Void Ratio

 Void Ratio 


The ratio of the volume of voids to the volume of solids is called void ratio. It is denoted by ‘e’




Short Note on Safe bearing capacity

 Safe bearing capacity

The Maximum load intensity which the soil can take without any risk of shear failure is called safe bearing capacity of soil. It is generally calculated by dividing the ultimate bearing capacity by a factor of safety

Short Note on Maximum Dry Density & Optimum Moister Content

 Maximum dry density & Optimum moister content


If a curve is obtained by plotting the moisture contents and their corresponding dry densties, the moisture content goes on increasing the value of dry density also goes on increasing till its maximum value is reached. This maximum value of dry density is called maximum dry density & “The moisture content corresponding to maximum dry density is called optimum moister content (OMC)”



Short Note on Active Earth Pressure & Passive Earth Pressure

Active earth pressure & passive earth pressure 


i. Active earth pressure When a retaining wall holds back a mass of clean , dry sand the sand has tendency to slip laterally in order to seek its natural slope or angle of repose thus exerting a push against the wall . This kind of pressure is called active earth pressure. It is a minimum pressure and it occurs when the retaining wall is at point of failure by moving away from the retained material.

Short Note on Atterberg limits

  Atterberg limits


The consistency limits are called Atterberg limits. These limits were first demonstrated by Atterberg in 1911, a Swedish soil scientist.


His limits are based on the concept that a fine grained soil can exist in any of the four states i.e. solid, semi-solid, plastic and liquid. Therefore, Aterberg limits, most useful for civil engineering purposes are:-

• Liquid limit:- The boundary between liquid and plastic state of soil.
• Plastic limit:- The boundary between plastic and semi-solid state of soil.
• Shrinkage limit:- The boundary between semi-solid and solid state of soil .

Short Note on Cohesive and Non Cohesive soils

Cohesive and non cohesive soils


Cohesion is the property of holding the soil particles together. The soils which have the properties of holding the soil particles together are called cohesive soils. Cohesion is used for shear strength of soil when tested with no lateral load applied to the soil sample. The soils which have not properties of holding the soil particles together are termed as cohesiveness soils. Cohesion is zero in case of dry soil.


Short Note - List out work required CRS sanction before execution at site.

  List out work required CRS sanction before execution at site. 


1. Under section 20 of Indian railway act and chapter VI of the "Rules for opening of a Railway of section of a Railway for the public carriage of passengers,1933” the sanction of commissioner of railway safety is required for the execution of any work on the open the open line, which will affect the running of trains carrying passengers and any temporary arrangement necessary for carrying it out, except in cases of emergency.

2. For the commencement and opening of the following works, when they are connected with or form part of railway already opened, the sanction of the commissioner of railway safety shall be obtained: 

Q. & Ans- Indicate the various stages involved in acquiring land for a new line project.

Question - Indicate the various stages involved in acquiring land for a new line project.

Answer - Following procedure will be adopted for land acquisition.

Application :- Whenever land is required for Railway purposes an application should first be made direct to Revenue Officer In charge of District in which the land is situated for statement of value of land and a draft declaration for acquiring it. Application should set forth clearly the purpose for which land is required and should have the complete set of land plans prepared in accordance.

When the work of acquisition extends to more than one district lies within the one division application should be made to Commissioner when in more than one division to the Chief Revenue Authority of State.

For better identification of land in cases where the areas to be taken up are expensive, following details should be given to State Government:

i. Name of the Railway.

ii. Copy of Order of Government when necessary.

iii. Brief description of route to be followed by Railway.

iv. A list of Civil districts in which the land will be required for the purpose.

Revenue Officers’ estimate of cost of land :- On receipt of application from Railway Administration a responsible Revenue Officer will forward to Railway Administration a stateme4nt showing the nearest approximate cost of land also a draft declaration under section’6’ of Land Acquisition Act on which it should be recorded there is no objection to acquisition of land.

When the estimated value of land exceeds Rs 25,000 in any one district or one lack in any division, it is necessary that the data should be countersigned by the Commissioner in which land is situated or Chief Revenue Authority of State respectively.

Statement of data received from Revenue Authority should be taken as representing the value of land, exclusive of tenants rights but exclusive of value of houses, trees, standing crops etc on the land the approximate cost of which should be separately furnished by Revenue Authority.

With the information in land the Railway Administration should proceed to frame an estimate of total cost of acquisition in detail the additional 15% laid down in section 23 ( 2 ) of land Acquisition Act on market value of land under section 23 ( 1 ) Clause - 1 of that Act.

Railway Administration Land Estimates :- It should have the following information :-

( a ) Value of Land :- ( I ) Waste ( ii ) Arable ( iii ) Homestead. ( iv ) Bazar

( b ) Value of :- ( I ) Masonry House. ( ii )Trees. ( iii ) Thatched House. ( iv ) Standing Crops.

Add additional 15% compensation under section 23 ( 2 ) on the market value of land including houses, trees and crops.

Add market value of Government land taken up.

Add damage under clauses 2 to 6 of Section 23 ( 1 )

Add capitalized value of land revenue (when necessary).

Add cost of establishment (when necessary)

Add contingencies

Sanction to land Estimates :- General Manager or any other officer duly empowered to sanction the estimate will than accord sanction and allot necessary funds and forward the estimate duly signed Accounts Office together with the draft declaration and duly signed plans and schedules to the State Government for taking necessary steps for acquisition of land. If the sanction of Railway Board is necessary to estimated cost of land Railway Administration should apply for and obtain that sanction before applying to State Government for acquisition of land.

Work bona fide Railway Purpose :- As a general rule land may not be acquired except in connection with a duly sanction work but this rule does not debar the acquisition of land for bonafide Railway purposes.

In case of urgency Railway Administration are empowered to depart from ordinary rule stated in the previous paragraph and sanction the acquisition of land prior to preparation and sanction of estimate either for work or the land, provided the total probable cost of work is within the power of Railway Administration to sanction.

Q & Ans - What is the difference between insulated joint and glued insulated joint?

Question - What is the difference between insulated joint and glued insulated joint? 

Answer - Difference between insulated joint and glued insulated joint –

Insulated joints –

Track circuited sections are ‘insulated’ electrically from the track on either side by insulated joints. The standard insulated joint in normal use, is made out of ordinary fish-plates duly planed on the fishing planes for accommodating channel type insulation between rails and fish-plates with ferrules/ bushes over the fish bolts and end posts between the rail ends.

Glued insulated joint –

Glued insulated joint have been developed using resin adhesives. These joints consists of web filling fish plats glued to the rails with a high polymer adhesive and bolted with high tensile steel bolts. The insulation is provided by special type of insulating side channels, bushes and end posts made of fiberglass cloth rovings.

Q. & Ans - What precautions are to be taken during deep screening by BCM, followed by tamping machine & DTS?

Question  - What precautions are to be taken during deep screening by BCM, followed by tamping machine & DTS?

Answer - Precaution to be taken during deep screening of track by BCM followed by TTM and DTS machines are as under -

1. All precautions laid down in LWR manual (specially those in para no. 6.3.2) shall be strictly followed.

Q & Answer - What are the different types of Engineering surveys under taken before construction of a new line/ Explain their scope and significance.

Q. What are the different types of Engineering surveys under taken before construction of a new line/ Explain their scope and significance.


Ans.- Different types of Engineering surveys –

Reconnaissance Survey -

Rough and rapid survey with or with out instrument of one or more routs for a proposed line is called Reconnaissance Survey. Approximate heights and distances are collected using instruments such as prismatic compass, hand level and range finder.

Q. & A - Describe the benefits of tamping in design mode.

 



Q. no. Describe the benefits of tamping in design mode. Also write down the pre tamping and post temping operations for tamping of T/outs including the points to be observed during tamping of turnouts for better retention of packing?


Ans: - BENEFITS OF TAMPING IN DESIGN MODE:- Working of tamping machine in smoothening mode reduces the track defects viz unevenness, cross levels and alignment to only limited extent. Wherever, the tamping in design mode correct the track parameters up to a design value thereby eliminating the track defects to a larger extent. Thus, good track geometry is achieved by working of
tamping machines in design mode. Comparatively longs sags and dips in track are eliminated by designing the vertical profile of the track. Also the long alignment defects are removed by using the
sufficiently long chords for designing the slews. However, obligatory points are to be kept in mind while designing the vertical profile and slews for tamping in design mode.

Q Bank - Accidents, Derailments & Disaster Management for Civil Engineering - MCQ (New Pattern)

(1)ACD means

(a)Anti collision Devise*

(b)Accidents causing death 

(c)Accidents causing derailment 

 (d)None of the above 

Answer - (a)Anti collision Devise*
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Index -

Question & Answer (62) Short Note - P Way (48) Civil Engineering - P Way (43) Short Note - Works (35) Store (34) Engineering (26) P Way (23) Permanent Way (P Way) (13) Duties & Responsibilities (9) Track Machines (9) works (9) Short Note - Bridge (8) Short Notes - Miscellaneous (7) Inspection (6) LWR (6) Patrolling of Rail Permanent Way (6) Civil Engineering - Works (5) Engineering - Book (5) Maintenance of P Way (5) Sleeper (4) Duties (3) Guideline (3) Handbook (3) Keyman / Mate / PWS (3) LDCE Exam (3) Points and Crossing (3) Rail Renewal (3) Rail Welding (3) 15.01 SURVEYING (2) Accidents (2) Ballast (2) Bridges (2) Chlorination of Water (2) Civil Engineering - Bridges (2) Deep Screening (2) Design of concrete mix (2) Distressed bridges (2) Distressing of LWR (2) Encroachments of Railway land. (2) Examination of Rails (2) Gateman (2) INDEX (2) Level Crossing (2) Level crossings (2) Maintenance (2) Maintenance in Electrified Area (2) Monsoon Patrolling (2) Permanent Way (2) Rail Formation (2) Rails Defects (2) Railway Organisation (2) Special Layouts (2) Speed Restriction and Indicators (2) Testing of Rails (2) Through Parking (2) Tiles (2) Track Circuited Areas (2) Track Tolerances (2) USFD (2) VIDEO (2) Working of Contractors (2) curves (2) quality control (2) 01. INTEGRATED CONCEPT AND OBJECTIVES OF MATERIALS MANAGEMENT (1) 01.02 रेलपथ निरक्षक तथा सहायक मंडल अभियंता के कर्तव्य (1) 02 रेलपथ (1) 02. ORGANIZATION OF MATERIALS MANAGEMENT DEPARTMENT (1) 02.01 90 यूटीएस रेलों के सम्भाल (1) 02.04 रेल तापमान (1) 02.05 रेल जोड (1) 03 स्लीपरो के कार्य (1) 03. CLASSIFICATION/CODIFICATION NOMENCLATURE OF STORES ON INDIAN RAILWAYS (1) 03.01 विभिन्न प्रकार के स्लीपरो की तुलना (1) 03.02 लचीले बंधन (1) 03.03 स्लीपर बिछाना (1) 04. PLANNING OF NON-STOCK ITEMS AND PROCESSING OF REQUISITION (1) 04.01 ट्रैक के लिए बैलास्ट प्रोफाइल (1) 04.02 फार्मेशन (1) 04.03 ब्रिज (पुल) (1) 05 पाइंट्स तथा क्रासिंग - परिचय एवं परिभाषाए (1) 05 PLANNING OF STOCK ITEMS & SYSTEMS OF RECOUPMENT (1) 05.01 विषेश ले आउट (1) 05.02 पृथक्रकरण (आइसोलेशन ) (1) 05.03 तथा क्रासिंग का अनुरक्षण तथा निरक्षण (1) 05.04 पॉइंट्स एवं क्रासिंग की (1) 06 गोलाई का प्ररंभिक ज्ञान (1) 06 PURCHASE POLICY (1) 06.01 वर्को का पुनः संरेखण (1) 07 Purchase Procedure on zonal Railways (1) 08 TENDER EVALUATION AND MISCELLANEOUS POLICY ISSUES IN PURCHASES (1) 08.01 व्यव्स्तिथ ओवरहालिंग (1) 08.02 रेलपथ अनुरक्षण का वार्षिक कार्यक्रम (1) 08.04 गहरी छनाई (1) 08.04.1 रेलपथ का उठाना लोवेरिंग तथा क्रीप (1) 08.05 छोटी वेल्डेड रेल ( एसडब्लूआर ) (1) 08.06 आन ट्रैक मशीन (1) 08.07 छोटी ट्रैक मशीने (1) 08.09 विद्युतीकृत सेक्शन में हाइट गेज (1) 08.11 अंडर ट्रायल सामग्री का रिकॉर्ड (1) 09 गति प्रतिबन्ध और संकेतक (1) 09 Receipt And Inspection of stores (1) 09.01 ठेकेदार की सुरक्षित कार्य प्रणाली (1) 09.03 रेल संरक्षा आयुक्त की स्वीकृति वाले कार्य (1) 10 निरक्षण का उद्देश्य (1) 10 ISSUE AND DISTRIBUTION OF STORES (1) 10.01 राइडिंग गुणवत्ता तथा राइडिंग इंडेक्स (1) 10.03 सिटीआर तथा टीजीआई (1) 10.04 रेलपथ प्रबंधन पध्दति (टीऍमएस ) (1) 11 RETURNED STORES (1) 11.01 स्लीपरो का बिछाना (1) 12 दुर्घटना (1) 12 Scrap Disposal (1) 12.01 ब्रीच (1) 12.02 डाईवर्शन (1) 13 INVENTORY MANAGEMENT (1) 14 लंबी वेल्डित रेल (परिभाषाए) (1) 14.01 एलडब्लूआर / सीडब्लूआरके लिये स्वीकृत स्थान (1) 14.02 एलडब्लूआरकी डीस्ट्रेसिंग (1) 14.03 एलडब्लूआर / सीडब्लूआर का अनुरक्षण (1) 14.04 रेलपथ पर्येवेक्षक - मेट तथा चाबीदार के लिए अनुमत तथा निषिद्ध कार्य (1) 15 - सर्वेक्षण (1) 15 बयाना राशि और जमानत राशि (1) 16 रेलवे टेंडर सिस्टम (Railway Tender System) (1) Active & Passive Earth Pressure (1) Anti corrosive treatment (1) Bearings in Bridge (1) Blanketing Material (1) Buckling of track (1) Building Work (1) CMS Crossing (1) CRS Sanction (1) CTR and TGI Value (1) Cant deficiency & Cant Excess (1) Census (1) Chequered Tiles (1) Chlorination Practices (1) Chlorine demand (1) Completion report (1) Contour & Contour interval (1) Correction Slip (1) Curing of Concrete (1) Design mode (1) Destressing (1) Disinfection of water (1) Duties of Gateman (1) E01.02 Duties of Keyman / Mate / PWS (1) E02.01 Permanent Way (1) E02.02 Handling of 90 UTS rails (1) E02.05 Rail Temperature (1) E02.06 Rail Joints (1) E02.07 Maintenance of Rail Joints (1) E03.01 SLEEPERS AND FASTENINGS - Functions of Sleepers (1) E03.02 Comparison between Various Types of Sleepers (1) E03.04 Laying of Sleepers (1) E04.02 Ballast Profile for L.W.R. track (1) E04.04 Bridges (1) E05.01 Points & Crossings: Introduction & Definitions (1) E05.04 Maintenance and Inspection of Points and Crossing (1) E05.05 Reconditioning of Points and Crossing (1) E06.01 Basics of Curves (1) E06.02 Realignment of Curve (1) E08.01 MAINTENANCE OF TRACK-Through packing (1) E08.02 Systematic Overhauling (1) E08.03 Annual Programme for Regular Track Maintenances (1) E08.04 Lifting/ Lowering of Track and Creep (1) E08.05 Deep Screening (1) E08.06 Short Welded Rail (1) E08.07 Maintenance of SWR (1) E08.10 Level Crossing (1) E08.11 Equipments at Level Crossing (1) E08.12 Maintenance / Examination / Inspection of Level Crossing / Gate (1) E08.14 Welding of Rails (1) E08.15 Records of Material under Trial (As per Cs.no 99) (1) E09.01 Speed Restriction and Indicators (1) E09.02 Safe Working of Contractors (As per Cs.No 95) (1) E09.03 Works Requiring CRS Sanction (1) E10.01 INSPECTION OF TRACK - Object of Inspection (1) E10.02 Riding Quality and Riding Index (1) E10.03 Track Recording and Oscillograph Car (1) E10.04 CTR and TGI Value (1) E12.01 ACCIDENTS AND BREACHES - Accidents (1) E12.02 Breaches (1) E12.03 Diversion (1) E14.01 LONG WELDED RAIL - Definitions (1) E14.02 Permitted locations for LWR/CWR (1) E14.04 Maintenance of LWR / CWR (1) E14.05 DOs and Don’ts OF LWR For PWM / MATES & KEYMAN (1) Egineering (1) Elastic Fastening (1) Elastic Rail Clip (1) FOB (1) Fabrication of Glued joint IN SITU. (1) Flushing cisterns (1) Greasing of ERCs (1) Grow More Food Scheme (1) H02 भण्डार विभाग का महत्व (1) H03 भण्डार डिपो की संरचना (1) H04 भण्डार का वर्गीकरण (1) H05 कोडिफीकेशन (1) H06 मानकीकरण एवं उसकी उपयोगिता (1) H07 वित्तीय औचित्य के सिध्दांत (1) H08 क्रय के विभिन्न माध्यम (1) H09 क्रय में विविध अधिमान्यताए (1) H10 भण्डार विभाग के अधिकारियो की क्रय शक्तियां (1) H12 निविदा समिति (1) H13 अनुबंध (1) H16 स्थानीय खरीद (1) H17 भण्डार डिपो में भण्डार प्राप्ति के स्त्रोत (1) H18 महत्वपूर्ण वस्तुए एवं उनकी खरीद (1) H19 भण्डार डिपो का संगठन एवं कार्य (1) H20 प्राप्ति अनुभाग की क्रिया - विधि (1) H21 वार्ड की क्रिया - विधि (1) H22 प्रेषण अनुभाग की क्रिया - विधि (1) H23 बहीखाता अनुभाग की क्रिया - विधि (1) H24 डिपो प्रणाली (1) H25 भण्डार का निरीक्षण (1) H26 अस्वीकृत भण्डार (1) H27 लौटाया गया भण्डार (1) H28 अग्रदाय भण्डार (1) H29 अधिशेष भण्डार (1) H30 रेल सामग्री की बिक्री (1) H31 रद्दी माल और नीलामी बिक्रिया (1) H32 वस्तु - सूची नियंत्रण (1) H33 स्टॉक सत्यापन (1) H34 मांगकरताओ व्दारा डिपुओ से भण्डार प्राप्त करने की प्रक्रिया (1) H35 संक्षिप्त टिप्पणीयां (1) Handling of 90 UTS Rails (1) Height Gauges on Electrified Section (1) Honey combing of concrete & its prevention (1) Hot Weather Patrolling (1) Imprest Store (1) Indicator Boards & Signages (1) Insulated joints (1) Isolation (1) Laying of Sleepers (1) Licensing Railway Land cultivation (1) Liner Biting (1) Maintenance of CMS Xing (1) Maintenance of Rail Joints (1) Maintenancee of SWR (1) Manson precaution (1) Numerical rating system (NRS) (1) Optimum moisture content (1) PWI (1) PWI / AEN / DEN (1) Pandrol Clip (1) Pile Foundation (1) Protection of Rail (1) Pumping Water Level (1) Rail Clusters (1) Rail Joints (1) Railway Affecting Works (1) Railway Construction (1) Realignments of Curve) (1) Reconditioning of Points and Crossing (1) Rehabilitation of Bridges (1) Renewal of Rail (1) River Training protection work (1) Safe Working (1) Safety at P. Way Work Site (1) Schedule of Inspection of Bridges (1) Sleeper Cribs (1) Soil Consistency (1) Static Water Level (1) Steel Structures (1) Stock sheet (1) TGI and OMS (1) Tender System (1) Thermit Welding (1) Track Inspection (1) Track Maintenance (1) Track Management System (1) Transitions (1) Turnout (1) Venerable location (1) Washable Aprons (1) Water Cement ratio (1) Water Quality (1) Water Supply (1) Water closetsu (1) Waterproofing (1) Well Foundation (1) Winter Precautions (1) Workability of Concrete (1) disposal of human waste: (1) distribution System (1) dry density (1) pass (1) rail fracture (1) safe speed (1) super elevation (1) track-Overhauling (1) urinals (1) wash basin. (1) weld failure (1) कार्य एवं उद्देश्य (1) ट्रैक रिकॉर्डिंग तथा दोलन लेखी कार (1) रेल पथ मेट के कर्तव्य (1)