The government said on Monday that it expects the MTR Corporation to submit an initial report on the train derailment incident by Wednesday, and a full report within two months.

The incident, which took place at Yau Ma Tei station on Sunday morning, significantly disrupted train services on the Tsuen Wan line for almost a day.

Around 150 passengers left the train via an emergency exit and walked all the way to Mong Kok Station through the tunnel.

Transport minister Lam Sai-hung told reporters that in Wednesday’s report, the company needs to explain the cause of the incident, and lay out what follow-up actions it plans to take.

He added that government departments will assist in the investigation.

"The Electrical and Mechanical Services Department has directed the MTR in writing to conduct a comprehensive review of the rail network's facilities and structures near the tracks, to ensure their safety," Lam said.

The minister also pointed out that the railway giant has been told to formulate stringent policies in regard to checks and maintenance to ensure the safety and reliability of its services.