The government is being urged to set clear guidelines for the completion of the horse tram line on Douglas promenade.
The Manx Electric Railway Society said as custodians of this "priceless asset" the government is "duty-bound" to save the line.
It comes after a statement from the infrastructure minister this week who announced delays to the project.
Tim Crookall said he had no idea when the 2022 season would start.
The last time a horse tram travelled the full length of Douglas promenade was October 2018.
A spokesman from the Manx Electric Railway Society said since its closure there's been a "hidden agenda" preventing reconstruction.
He added: "It is simply not good enough for the Minister Mr Crookhall to declare that he is not prepared to ask for funds for this scheme for the next year or so and our democratic guardians should be encouraged to turn on the pressure to execute their decision to re-build the line for the full length of the route".
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