TfL warned of delays on several lines this morning (Picture: SOPA)
Delays have already been reported across the London Underground this morning during rush hour.
It is not a pretty sight on the Circle, Hammersmith & City and Metropolitan lines amid overnight engineering work.
Transport for London (TfL) is warning of severe delays on the Circle Line and minor delays on the other two lines.
Engineers working at Tower Hill and Harrow-on-the-Hill are understood to have finished late last night, leading to the disruptins.
Currently there is good service on all other lines.