Now, complete tracks are electrified from Delhi to Mughalsarai via Sultanpur. But, still many trains are running with Diesel loco. Why? No one knows. Some trains can easily runs with electric locos with below adjustments.
1. 12391/12392 Shramjeevi exp. Loco can be change on Mughalsarai or Patna.
2. 13119/13120 Delhi Sealdah exp (Bi weekly) can run with electric loco up to Kiul in DN and from Kiul to Delhi in UP. Loco change at Kiul.
3....
more... 13413/13414 Farakka Exp (Tri weekly). This train is also can run with Eloco up to Kiul from Delhi in DN and in UP from Kiul to Delhi. Note that this train is not running via Moradabad.