On show will be a fully restored 1869 Carriage AB4, which the Inveresk division of the Don River Railway has been working on since 2011.

The carriage was originally built for use on the Launceston and Western Railway, has been refurbished both inside and out, and is one of the oldest of its type in the world.

Finishing touches were being made to the carriage on Wednesday.

"Its technical name is an AB4, with A meaning it has first class, B meaning second class and four is the fact it is the fourth in the series," Inveresk division of the Don River Railway member and former Don River Railway president Bill Reynolds said.

"In the centre, it has its two first class compartments and at each end the two second classes, and the first is quite a different kettle of fish overall."

This restoration is a follow-up to the group's Royal Carriage restoration, and the fourth total restoration the group has completed

"Our charter is to create a history of the Tasmanian railway system, so restoration is pretty high on that list," Don River Railway president Bill Housego said.

The carriage will be on display between 9am and 4pm on Saturday at Inveresk, before moving to the Don River Railway where it will be on permanent display.