Commuters faced severe travel disruption this morning after a raft of train cancellations and delays across London.
Signalling problems at Marylebone caused a host of cancellations on Chiltern Railways services from about 5.30am.
All trains between London and Banbury in Oxfordshire were affected, the railway said.
Engineers eventually fixed the problem but delays of up to an hour were expected to last until at least 10am.
<blockquote class="twitter-tweet" data-cards="hidden" lang="en"><p dir="ltr" lang="en">Want to know what fear is? Heading to Marylebone Station & finding out that EVERY train is cancelled <a rel="nofollow" target="_blank" href="https://twitter.com/chilternrailway" class="body-link" data-vars-item-name="BL-39791-https://twitter.com/chilternrailway" data-vars-event-id="c23">@chilternrailway</a> <a rel="nofollow" target="_blank" href="https://www.awin1.com/awclick.php?mid=9&id=222025&p=http://t.co/VWIZMmFEmM" class="body-link" data-vars-item-name="BL-39791-http://t.co/VWIZMmFEmM" data-vars-event-id="c23">pic.twitter.com/VWIZMmFEmM</a>— Stanley (@StanleyIy_) <a rel="nofollow" target="_blank" href="https://twitter.com/StanleyIy_/status/603452555725778944" class="body-link" data-vars-item-name="BL-39791-https://twitter.com/StanleyIy_/status/603452555725778944" data-vars-event-id="c23">May 27, 2015</a>
<blockquote class="twitter-tweet" data-partner="tweetdeck"><p dir="ltr" lang="en">The glory of the chiltern line. Tough on tickets tough on the cause of tickets. No trains to Marylebone; solves all ticketing issues <a rel="nofollow" target="_blank" href="https://twitter.com/hashtag/fail?src=hash" class="body-link" data-vars-item-name="BL-39791-https://twitter.com/hashtag/fail?src=hash" data-vars-event-id="c23">#fail</a>— geoff mackay (@geoffmackay) <a rel="nofollow" target="_blank" href="https://twitter.com/geoffmackay/status/603455355801227264" class="body-link" data-vars-item-name="BL-39791-https://twitter.com/geoffmackay/status/603455355801227264" data-vars-event-id="c23">May 27, 2015</a>
Meanwhile, Southeastern services in south London were also severely hit by signalling issues.
There were a number of trains cancelled between Dartford and Victoria as a result of the problems, with disruption likely to continue until 10am.
<blockquote class="twitter-tweet" lang="en"><p dir="ltr" lang="en">The first trains between Victoria and Dartford have been cancelled because of the signalling problems near <a rel="nofollow" target="_blank" href="https://twitter.com/hashtag/Lewisham?src=hash" class="body-link" data-vars-item-name="BL-39791-https://twitter.com/hashtag/Lewisham?src=hash" data-vars-event-id="c23">#Lewisham</a>— Southeastern (@Se_Railway) <a rel="nofollow" target="_blank" href="https://twitter.com/Se_Railway/status/603421579075280896" class="body-link" data-vars-item-name="BL-39791-https://twitter.com/Se_Railway/status/603421579075280896" data-vars-event-id="c23">May 27, 2015</a>
