Private siding refers to privately owned siding constructed/ laid out by a party at its own cost for railway freight services at the premises of plant or manufacturing unit or production unit or mines etc under a special agreement.

Siding owners have option to maintain the siding track either himself or through the railways. Siding owners are responsible for maintaining his siding properly at all times so that train operations are not hindered.

UNIRAIL has been maintaining about 1075 kms of railway track including Ballasted Tracks at Private Sidings & Rail Corridors, and Ballast less and elevated tracks for Delhi Metro and Chennai Metro.

Various Types of Track Renewal Processes

• Complete Track Renewal (CTR) refers to the most thorough track replacement regime where rails, sleepers, etc., are fully replaced.
• Through Rail Renewal (TRR) refers to the replacement of rails in a given section of track,
• Through Sleeper Renewal (TSR) refers to the replacement of sleepers.
• Through Turnout renewal (TTR), Through Fitting Renewal (TFR), Through Weld Renewal (TWR), and Through Bridge Renewal (TBR).
• Each of these has a more thorough (‘primary’) and less thorough (‘secondary’) versions, hence you see the acronyms like ‘CTR(P)’ for ‘Complete Track Renewal – Primary’, or ‘TSR(S)’ for ‘Through Sleeper Renewal – Secondary.

Additionally, there are ‘Casual’ renewals, which refers to renewals of any kind that happen not on a predetermined schedule but as determined based on patrolling and inspection of tracks, in small continuous stretches. Finally, ‘Scattered’ renewal (SR) refers to ad hoc replacements that happen at isolated points. Switch expansion joints (SEJ) are provided at the ends of long welded rails to allow for the cumulative thermal expansion movements of the ends of the rails.