The incident occurred when two wagons of a goods train coming out of Panki yard got derailed and one of them hit a high-voltage electricity pole and left it leaning, Chief PRO of NCR Sandip Mathur said.
No one was injured in the incident, he confirmed.
As the electricity pole was damaged the power supply to Delhi-Howrah track was disrupted, he said.
Some trains were running behind the scheduled time on the route.
Around 11pm, the rail traffic movement was restored on the Delhi-Howarh route, Mathur said.
A team of railway officials and engineers visited the site, he said adding, efforts were being made to remove the derailed wagons at the earliest.
A probe has been ordered into the incident, Mathur said.