Delays to train services until about 9pm following an earlier technical fault

There are delays to commuter train services until about 9pm due to an earlier technical fault.

Update 22 Feb 8.30pm. Delays possible until about 9m due to the earlier technical fault

Train services on the main line were earlier disrupted due to power supply problems. The initial problem was fixed but then trains were queued due to a fault in the traffic control system.