Problems with the trains continued for several months following the May timetable changes. Picture: Nick Gill (Image: Archant)
A power issue with two trains at Cambridge is causing disruption further down the line at Royston and Letchworth.
Trains being unable to take power have meant a reduced service is operating to and from Cambridge until 9am.
In the meantime, some services will be terminating at Royston and restarting at Letchworth.
To follow the incident on Twitter, go to https://twitter.com/hashtag/Cambridge?f=tweets
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