A wilderness railway tourist attraction in Tasmania has partially suspended services after the front wheels of a steam locomotive transporting about 90 people came off the tracks.

No one was injured in the West Coast Wilderness Railway derailment on February 28 outside the town of Strahan.

Acting general manager Ian Robertson, who described the incident as fairly minor, said the train was travelling "very slowly" at the time and all the carriages remained on the tracks.

The matter is being investigated by the Office of the National Rail Safety Regulator.

Mr Robertson said services departing Strahan had been suspended, but half-day trips from nearby Queenstown were not affected.

"We have investigated and reported our findings to the national regulating body," he said.

"We have more work to do before I am fully satisfied that there is minimal risk in continuing journeys along this section of track."

Mr Robertson said it was a "huge" logistical challenge to get the 90-odd passengers back to their point of departure at Strahan by bus.

The West Coast Wilderness Railway runs journeys on a 35km section of wild rainforest track between Queenstown and Strahan.

Mr Robertson said staff had copped abuse from some customers when informing them their bookings had been cancelled.

"(This) is unacceptable. These cancellations impact our team too and they deserve better," he said.

He said the railway had enjoyed a record-breaking summer, regularly booking out months in advance.