Last Friday evening, at about six o'clock, some poor soul lost their argument with the front of a Northbound Chiltern Railways' train at Beaconsfield. The line was closed for two hours, a family received some very bad news, and the services were completely messed up until the last few trains of the day.
I got home one train in-front so did not suffer the problems that thousands of people did.
Tonight I was a bit later coming home - a train a couple behind mine broke down on the Northbound line at Neasden, at one time trapping five trains behind it. I suspect they've managed to move it into the depot or sidings at Wembley, as trains appear to be moving again with some minor delays and just the odd cancellation.