At 06:45 the Metropolitan line was part suspended with no service south of Wembley Park due to a signal faliure.
The ramifications of this went on until about 11:15 when a notice was given on TfL's status page to expect a 45min suspension of the service south of Harrow-on-The-Hill to allow for emergency engineering works to take place at Wembley Park.
Now it is here that the information gets sketchy. Between 12:45 and 13:45 the service suspension is shown to have been lifted before being re-instated for a brief interlude between 14:00 and 14:15 with severe delays running up until 15:30 and irregular service gaps persisting until 16:45.
Firstly, are the above service statutes loosely accurate and secondly, what was the root cause that gave the Metropolitan line so much grief today.
Last Edit: Sept 6, 2017 5:30:37 GMT by superteacher: Date added to title
I got onto a southbound Met at Harrow at approx 12:35 headed for Aldgate (had changed off a Chiltern service and unaware there were any issues on the Met). It made slightly slower progress than normal (maybe 5mins extra) up until Wembley Park, then pretty much as normal to Finchley Road. Due to the slow travel I did look up the status on the TFL homepage (at about 12:45) - it said severe delays and that the line was expected to be completely closed for 45 minutes from 13:30. I just checked the tubestatus link above and it was the message as listed for 12:45. I noticed there were northbound Met trains running north of Finchley Road. Perhaps by around 12:50 the northbound service had just resumed. I'm not sure whether the southbound train I was on was the first southbound, I didn't have to wait at all at Harrow - but it was barely half full.