Members of a former coal mining community are battling to save "a piece of their heritage".
The Gyfeillion Colliery footbridge in Hopkinstown, Rhondda Cynon Taff, closed in 2014 due to safety concerns.
It is the responsibility of Network Rail and the county council and both parties have confirmed they are progressing with plans to remove it.
Resident Chris Pick said he would be "outraged if it was demolished".
Known locally as Smokey Bridge, Mr Pick said it was one of the last remaining structures to remind the village of its "proud mining heritage".
"All the rest has been torn down and built upon," he said.
"The miners used this bridge to safely cross the railway and many of their grandchildren and great grandchildren live in Hopkinstown today.
"To tear down the bridge is to destroy their heritage."
Lyndon Francis grew up in Graigwen and spent his childhood playing in Hopkinstown.
"Smokey Bridge was and still is special to Hopkinstown people," he said.
"As kids we would stand on the bridge and watch the steam trains as they passed and the smoke would engulf us."
Stuart Caddy said: "Too many historical landmarks have been lost locally, and Hopkinstown is rightly proud of its mining heritage which is being completely ignored."
A Rhondda Cynon Taf council spokesman said the bridge was in a "very poor condition structurally" and a £1.5m investment would be needed to replace it.
They said there was a suitable alternative route for pedestrians nearby and "in almost three years since the bridge's closure, the council has received just one query from a resident about its status".
A spokesman added: "Having considered its low-usage when open, the significant cost to the public purse for its replacement and upkeep, and the future potential hazard it could cause to the railway line, a decision has been made for all parties to progress an extinguishment order on the route."
A Network Rail spokesman said it had to "balance the needs of those who are keen to retain various historical assets with their responsibility to provide a safe network with the best value for money to the taxpayer".
He said they were working closely with the council to consult with Cadw - the Welsh Government's historic environment service - on its plans to remove the bridge.
Residents have until 25 August to object to the extinguishment order.