Train disruption on the St Albans to London Thameslink line was due to two faults this morning.

Railway commuters are subject to 20 minute delays or cancellations into the capital after the 5.28am Selhurst service lost power arriving into London Bridge.

Network Rail investigators found the train had lost its shoe gear - a vital piece of equipment which enables the train to harness power from the third rail.

Platform 14 was blocked while specialist technicians repaired the line.

In a separate incident, there was also a signalling problem between London Blackfriars and London St Pancras International.

The system stopped being able to automatically verify if the next section of track is clear, and as a result, trains were forced to stop.

Drivers had to reroute onto a different line to bypass the problem, but this caused delays of about 15 minutes.

Passengers should expect problems until about 8am.

For more information about the London Bridge incident, visit www.nationalrail.co.uk/service_disruptions/201453.aspx

For more information about the London Blackfriars problem, visit www.nationalrail.co.uk/service_disruptions/201450.aspx