India, Nov. 11 -- The city's metro network has recorded two derailments in less than two months, even as new lines near commissioning. Despite the Maha Mumbai Metro Operation Corporation Limited (MMMOCL) publicly describing the September 24 incident as a "minor technical glitch", officials familiar with the matter say the city's first-ever metro derailment on September 24 was caused by a breakdown in communication during a trial run on Metro Line 9.

The derailment occurred around 5am, when an empty metro rake was returning to the Charkop depot after overnight testing. The rake, stationed for trial runs at Mira-Bhayandar, was required to travel via the Metro 2A and 7 corridor and switch onto the Metro 7 line. During this movement, the tra...