India, Nov. 5 -- A Mumbai Monorail rake derailed on Wednesday morning outside its car depot in Wadala, but the Mumbai Metropolitan Region Development Authority (MMRDA) sought to play down the incident, describing it as a "mock drill."

The monorail's operations and maintenance are handled by the MMRDA's subsidiary, Maha Mumbai Metro Operation Corporation Limited (MMMOCL). The city's sole monorail system has been out of service since September 20, following repeated disruptions and technical faults during this year's monsoon.

According to sources, the incident occurred around 9.30 am when a newly delivered monorail rake, manufactured by Medha Servo Drives, was undergoing a trial run near the depot. The train was being moved from one guide...