It followed transport disruption in the heart of the city's financial district.
The Bank station serves two London Underground lines, as well as an underground part of the Docklands Light Railway (DLR) which connects central London with the east of the city, including the separate financial district of Canary Wharf.
"Firefighters will shortly be leaving Bank. It was a small track fire in a DLR tunnel. It had burnt out before crews arrived," London Fire Brigade said in a statement.
London's transport authority said it had shut the line between Bank and the next station, Shadwell, on the route from central London to Canary Wharf.
The rest of Bank station was open, Transport for London added.
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