***SR Unique - Innovation/Passenger oriented***
1. First zone to electrify single line tracks.
2. First zone to come with new pest control system.
3. Connects almost all its district HQ with Chennai with dedicated or daily train.
4....
more... First Shatabdi with both Electric and Diesel loco.
5. Vaigai is first of its kind train with Vestibules and tubelight fixture.
6. TN is first of its kind train.
7. More 24/23 coach rake train which restricts SR to augument trains.
8. Runs/Ran FC coach for more trains.
9. Sapthagiri is first of its kind train.
10. Used Twin Loco in MG.
11. MG EMU. MG Electric.
12. First experimented DD.
P.S: Corrections are always welcome