See some SS of official PDF
Plus
As per LHB now..
2500 km se jyda agar trip hota h to rake ko lit me le jate h for checking and inspection..
PM me jis...
more... zone ki train hoti h vha pe hota h
SM jaha train single trip pe aati h agar 2500 km se less h distance to majority ye hota h ki usko Pf se hi inspection krke vapas bheja jata h aur jo b saaf safai, water filling hoti h
Example- Telangana Express & Kerala Express
Dono train NDLS pe late aai kuch din phle
Telangana right time departure hui 2 hours k andar bcoz usko pf se hi vapas bheja gaya
But Kerala express ko pitline me gae for Inspection..
I hope this clears