What is included in the 3-tier maintenance regime?

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What is included in the 3-tier maintenance regime?

July 19, 2019, 12:13 PM

The three-tier system divides responsibilities for track maintenance as follows:

1. On-Track Machines (OMU). Mechanized maintenance (see above) including systematic tamping, intermediate tamping, shoulder ballast cleaning, ballast profiling and redistribution, track stabilization, and periodic deep screening of ballast.

2. Mobile Maintenance Units (MMU). These are of two types. MMU-I refer to the permanent way units that are assigned to deal with spot tamping, in-situ rail welding, casual renewal and repairs, overhaul of Level Crossings, glued joint replacement, and machining of rails including cutting, drilling, grinding and chamfering. Normally there is one MMU-I unit for each Permanent Way Inspector’s office. MMU-II refers to the units specially assigned for reconditioning turnouts, switches, joints and other such intricate trackwork.

3. Sectional Gangs. These are permanent way gangs that handle patrolling (including keyman’s daily patrols, hot and cold weather patrols, and monsoon patrols), and watching vulnerable locations, bridges, turnouts, switch expansion joints, level crossing approaches, etc. In addition these teams handle minor maintenance including temporary repairs, lubrication of elastic rail clips (ERC) and joints, changing rubber pads, liners, and clips, minor cess repairs, cleaning drains, boxing ballast, manual adjustments of loops and creep / gap adjustments, cleaning crib ballast and handling other drainage issues, deweeding, removing boulders and other debris, and pre- and post-tamping attention. Periodically, the sectional gangs also carry out maintenance such as picking up slack in the permanent way.

Source – IFRCA.org

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