The incident happened before 7am this morning but was still affecting services more than an hour later.
No service while we deal with a derailment of an empty train— Waterloo & City line (@wlooandcityline) April 1, 2016
There was no word on when the service would be back up and running.
Commuters were being advised to use the Jubilee and Northern Lines to get from Waterloo to Bank station while the team resolves the issue.
Or you could make the most of the sun while it's out, and walk...