Travellers through Welwyn Hatfield and Potters Bar should keep an eye on rail updates as Great Northern makes unexpected amendments to its new timetable.

https://twitter.com/GNRailUK/status/998444622295814145

After introducing a brand new timetable to travellers on Sunday, May 20, the rail operator Great Northern has announced that it will have to run an amended timetable in the short-term as it phases in the service.

This appears to be unplanned.

The new timetable caused chaos on the line on Sunday, with numerous services cancelled.

A handful of trains on Monday have been cancelled or delayed.

An announcement on the Great Northern website said: “Short-term timetable amendments mean fewer trains are able to run.

“Trains running across the Thameslink network are running as normal but some services may still be revised.”

The rail operator’s Twitter feed was swamped with enquiries, and tweeted: “Due to a high volume of tweets we may not be able to answer everyone.”

Great Northern announced at 7.45am that the disruption is caused by the introduction of new carriages to the service.

“The majority of this has been carried out over the weekend, but it is not possible to change over the entire fleet in this short time frame without risking disruption to services.

“The remaining new trains will be brought onto the network as the summer progresses.”