The underpass at Gloucester Railway Station will be closed for nine months while refurbishment works take place.
Great Western Railway will close the subway in January while work is underway to make it step free.
They will also be installing improved lighting and a widened northern entrance to remove the current blind corner.
However, pedestrians who do not have a train ticket will not be allowed to use the station’s footbridge to get across.
Councillor Jeremy Hilton asked Gloucester City Council chiefs what was being done to provide access to the footbridge at a meeting last week.
He welcomed the news that work on upgrading the subway will start in January but is concerned the underpass will be closed for nine months.
“This is a well trodden route and a shortcut from the hospital to the bus station. What is being done to give pedestrians access to the footbridge at the railway station so they don’t have to make a long diversion?”
Council leader Richard Cook said railway authorities were asked about access to the footbridge but were not very keen.
He said he will ask officers to approach them again to see if it is a possibility going forward.
“But I imagine officers are preparing to put signage up to ensure that pedestrians can find an appropriate way around outside of the station.”
A spokesperson for GWR said the works are part of wider improvement work to the station that is being delivered by them, Network Rail, Gloucester City Council, GFirst LEP and Gloucestershire County Council.
“Also included in this phase will be station forecourt improvements for bus and pedestrian access,” they said.
“Network Rail will also be working on the track trays in the roof of the subway so that it can be fully decorated to make it brighter, lighter and more pleasant to use.
“Work on the subway will make a significant improvement for users. Unfortunately, it is not possible to keep it open during work to it, and this will mean a five-minute alternative walking route around the station.”