There will be an increased police presence on Blue Mountains trains and stations as a result of a number of acts of anti-social behaviour and malicious damage at Mountains train stations.
The most recent attacks were an assault on a 'quiet carriage' on approach to Lapstone station and an assault and robbery of a Newtown man near Hazelbrook station earlier this month.
It follows police arrests for graffiti offences, property damage, assaults and drugs offences at Hazelbrook, Wentworth Falls, Woodford and Glenbrook stations earlier in the year.
Officers from Police Transport Command will be working with local police. Some will be in uniform, and others will be wearing plain clothes.
Detective Superintendent Paul Devaney, Commander of the north west sector of the Police Transport Command said, "We are committed to providing a safe environment on the transport network and we will continue to target those persons engaging in criminal and anti-social behaviour."
Supt Devaney said 110 Police Transport Command officers were deployed in the western Sydney region, and this would be increased to 177 by December.
He said officers could be on any train at any time, would also be checking tickets, and there would be a permanent increased presence in the Mountains.
Superintendent Darryl Jobson from Blue Mountains Local Area Command welcomed the partnership.
"Officers from the Police Transport Command and Blue Mountains Local Area Command are working in collaboration to ensure that we have safer communities, in particular addressing crime and anti-social behaviour on the transport network and around railway station precincts".