RAIL services between Huddersfield and Sheffield were halted by vandals.
Passengers on the Penistone Line suffered delays and cancelled services after a road-roller was driven on to the track.
The 2.5-tonne vehicle was driven through a corrugated iron fence, down a 5ft embankment and on to the railway line at Quarry Junction, near Barnsley, at 3.30am on Saturday.
Rail workers saw two people leaving it.
The road-roller was pulled off the tracks and trains were given the all-clear to run again from 6.56am.
But there was a knock- on effect and many passengers waiting to catch later trains to and from Huddersfield suffered delays or cancelled services.
A spokeswoman for Network Rail, the organisation which manages the rail infrastructure, said: "Capability was there to take services, but it probably had a knock-on effect of not having the earlier services where they would normally be at that time in the morning."
* British Transport Police are appealing for information about the road-roller incident.
Contact freephone 0800 40 50 40 and quote log number 63 and the incident date.