Thieves have stolen 21 vintage signs from Arley Railway Station, near Bewdley, which were restored and have been on display for many years.
They were a mixture of enamel advertising signs and Great Western Railway notice cast iron signs – and only one of the cast iron signs has been recovered.
Volunteers at the tourist attraction today issued an appeal for people to keep their eyes peeled.
Anyone who sees any of the signs, or may be offered one to buy, is asked to report it to the railway or police.
The enamel signs advertise brands such as Colman's mustard, Champion bread cakes and Spratt's.
Other signs say 'private' and 'shut the gate'.
Leonard Warrington, one of SVR's volunteers, said they had been stolen over two nights.
He said a white van was spotted near the railway station on Sunday evening, which he believes may have been used to cart the signs away.
Leonard said: "They took nine enamel signs early on Monday morning towards the north end of the station, and then I got another call saying that more had been taken on Monday night.
"They had taken another nine enamel signs as well as three cast iron signs.
"After getting a call from a farmer saying something was sticking out a hedge, we found one of the cast iron signs there.
"They are heavy – the cast iron ones especially – so maybe they couldn't carry it and chose to leave it behind."
He said the signs had been on display at the station for many years.
"We are really upset that they've been stolen," Leonard said.
"It's not so much the cost. We spent many hours restoring them.
"All of the enamel signs have a coating of SmartWater and if anyone sees them or is offered any of the signs, we are asking them to contact the police or the railway."
Lesley Carr, spokeswoman for SVR, said: "Our volunteers at Arley station have worked hard to collect and restore these vintage signs.
"They take huge pride in looking after the buildings and platforms, so that they look attractive for our visitors.
"It’s awful that this has happened, especially now as we’re getting the railway ready to reopen on April 12.
"We have reported the theft to the police and removed further signage from the station."
People can pre-book their tickets online for the attraction ahead of it reopening.
Visit svr.co.uk to find out more.