Sheffield MPs have written an urgent letter to the government asking it to keep buses and trams running when emergency funding ends this week.
Supertram services in Sheffield and Rotherham could be mothballed if the government fails to step in with further resources, Sheffield City Region Mayor Dan Jarvis has warned.
Sheffield City Region bosses were given £1.3m in May to support the Stagecoach Supertram network following a massive reduction in passenger numbers due to the coronavirus pandemic.
Government intervention is set to end today and Mayor Jarvis has described shutting down the service as a "terrible situation" but it would come as a "last resort".
Labour MPs Clive Betts, Olivia Blake, Paul Blomfield, Gill Furniss and Louise Haigh have now intervened and written to Transport Minister Grant Shapps.
Mr Betts, who recently led a review of buses, said: “Keeping buses and trams running is absolutely essential to allow key workers to get to work.
“Having bus operators go out of business or the tram stopping running will cause short term chaos in essential services and in the longer term add to the problems of congestion, pollution and climate change.
“The Government’s financial help so far has been welcome and essential but it must continue.”