I walked up to Marylebone last night. Just after I had arrived I got a text message from tfl to say that there were severe delays on the Central Line due to a fire alert at Mile End.
There followed a sigh of relief that I had walked, and then I thought no more of it.
That was until my big train passed a Central Line train on the approach to South Ruislip. The tube train had large numbers of people standing and it looked very full.
Bearing in mind that South Ruislip is in Zone 5 and half an hour from central London on a good day, it must have been an unpleasant journey home last night for many thousands of people.