A Transport Coordination Group spokeswoman said the clean up effort means trains will be allowed between Springwood and Katoomba for the first time since yesterday's landslides.

"The 3.50pm Blue Mountains train from the city will be the first for the day to travel the full length of the line, without the need to change to buses.

"Passengers travelling to the Lower Blue Mountains are expected to depart and arrive on time. However, passengers travelling through Lawson should allow an extra 15-20 minutes travel time for their journeys, as trains need to pass through that area at slower speeds while clean up work is finalised."

Those travelling from the Blue Mountains to Sydney are still being asked to catch buses between Katoomba and Springwood.

The announcement comes after a train derailment caused by one of three Mountains landslides saw train services shut down yesterday afternoon.

Police were this morning warning commuters and motorists travelling through the Mountains to expect delays of up to an hour.

Limited train services were left operating between Lithgow and Katoomba but commuters were urged to make their way to Springwood or Penrith stations.

The minor train derailment of the city-bound train between Linden and Woodford resulted in the closure of the railway line, according to police.

The driver of the four carriage train is understood to have seen debris on the track in advance and slowed down. Police said the front wheels of the train derailed, causing all services to be stopped between Springwood and Lithgow.

Approximately 200 passengers who were onboard the train were removed and walked off the tracks to nearby buses. Police reported no injuries.

Emergency services also responded about 4.30pm after a railway embankment collapsed at the bottom of Boddington Hill at Bullaburra, causing the shutdown of eastbound traffic and the westbound rail line..