Short Note on TGI & OMS

TGI and OMS :- It is utmost important to ensure passenger comfort and safety of track. In order to improve longevity of assets. This can be achieved by frequent inspection, detection of irregularities and their quick elimination, various method of inspection has been adopted by P.Way engineers.

i. By manual inspection.

ii. By track recording cars. 

a. OMS-2000 :- To ensure the comfort of passengers the micro processor based system adopted to record the vertical and lateral acceleration due to gravity. The results obtain digitally in the form of peaks. 

b. The criteria of condition of track bases on peaks per km. (PPKM)

i. Outstanding:- Upto 0.25

ii. Very Good :- >0.25 to 1.0

iii. Good :- >1 to 2.00

iv. Below Avg. :- More than 2

TGI:- Is the method to assess the conditions of track parameters or obtained by standard deviation based composite track index which is work out for block of 200 mtr track this composite index is based on the individual indices of unevenness, twist, gauge and alignment measured for a block of 200mtr length of track. TGI is defined as under

TGI = 2UI+TI+6AI+GI 10

UI= Unevenness Index

TI= Twist Index

AI= Alignment Index

GI= Gauge Index

Based on TGI value classification of track is as under:-

i. Outstanding:- 80 and above.

ii. Very good:- 50 to 79

iii. Good:- 36 to 49

iv. Below avg.:- Below 36