Original sentence: It is headquartered at Hajipur and comprises Sonpur and Samastipur divisions of North Eastern Railway and  Danapur, Mughalsarai, and Dhanbad divisions of Eastern Railway.Routes include:
Edited sentence: East Central Railway website.It is headquartered at Hajipur and comprises Sonpur and Samastipur divisions of the erstwhile North Eastern Railway and  Danapur, Mughalsarai, and Dhanbad divisions of the erstwhile Eastern Railway.This zone came into existence on September 8, 1996