KiwiRail could spend up to $50 million on new carriages for its tourist trains as it rides the tourism boom.
The company is also rebranding its Cook Strait ferry and scenic train services under one brand, The Great Journeys of New Zealand.
KiwiRail's group general manager sales and commercial, Alan Piper, said a request for proposal for up to eight carriages had been sent out as the company experiences double digit growth on its scenic services as a result of the influx of overseas tourists.
The company was expecting to spend between $35m and $50m.
More than a million passengers used the Northern Explorer, TranzAlpine, Coastal Pacific and Cook Strait ferries during the past year.