 The Bankstown train had tripped past a train stop at red, in accordance with the rules.On 19 December, five people were killed and 748 injured when a Bankstown-bound train crashed into the rear of an East Hills train at Sydenham station.A signal electrician was manipulating a failed track circuit relay, but was distracted and forgot to release the track circuit when the train passed, causing a wrong side failure and the collision.