Short Notes on Pre & post tamping operations for TRT machines.

 Pre & post tamping operations for TRT machines. 

TRT machine is being used for carrying out TRR and TSR simultaneously in the field. 

Pre-Tamping operation :

i. Field survey should be carried out to determine existing profile of track and to decide the general lift. In case of design mode working, the survey should be done as per guidelines.

ii. The beginning and the end of curves/ transition curves should be marked on sleepers. Super- elevation and slew should e marked on alternate sleepers to act as guide for the operator. 

iii. Low cess should be made-up. 

iv. Track drainage should be improved for better receptivity of packing. Pumping locations should be attended. Rounded ballast should be replaced with clean and angular ballast. 

v. Deficient fittings and fastenings should be made food and all fittings and fastenings likem fish bolts. Keys, cotters, loose jaws elastic rail clips, pads etc. should be properly tightened. Worn out fittings should be replaced. vi. Broken and damaged sleepers shall be replaced. 

vii. Distressing of rails, adjustment of creep, expansion gaps in joints, buffer rails and SEJs etc, if necessary, shall be carried out.

POST TAMPING OPERATIONS:- The section engineer (P.Way) shall pay attention to the following items:-

i. Checking and tightening of loose fittings. 

ii. Replacement of broken fittings. 

iii. The ballast shall be dressed neatly; proper consolidation of ballast between the sleepers shall be done.

iv. If the recorder is not available parameters of at least four stretches of 25 sleepers each per kilometer of tamped track should be recorded, in addition the versins and super- elevation of curves shall be recorded for at least ten stations at a specified chord length.

iv. While working in LWR territory, the provisions of manual of instructions on long welded rails-1996 should be followed. 

iv. The fixture like check rails removed during pre-tamping operation should be restored.