At least seven bogies and the engine of the Ernakulam-bound Jaipur-Ernakulam Express derailed on Saturday morning about 111 km from Mumbai between Kasu and Pen, railway sources said.
The derailment occurred at 0628 IST. There were no casualties, Central Railway Chief PRO Sunil Jain said.
The train left Jaipur on Friday. It goes via Panvel and Roha without touching Mumbai on the Konkan route, he added.
The Central Railway has made arrangements for bringing passengers back to Panvel.