Sleeper train overshoots a platform at Edinburgh Waverley
An investigation has been launched after a Caledonian Sleeper train arriving at Edinburgh Waverley overshot the platform.
The Northbound Lowlander service ended up several hundred yards to the east of the station after the 08:45 incident.
It blocked a junction, halting trains to and from North Berwick, Dunbar, Tweedbank and London.
The train's operator, Serco, said early indications were that there were no technical problems.
However, officials from the TSSA transport union suggested the overshoot may have been caused by a fault in the brake system.
The union has now called for the immediate grounding of the Caledonian Sleeper fleet while investigations go on.
General secretary Manuel Cortes said: "Clearly this is an incredibly serious situation which calls for nothing less than the grounding of the entire new Sleeper fleet until we have the full details of the what went wrong.
"No one should be playing fast and loose with faulty brakes on our railways and Serco need to wake up to that fact and act now."
Ryan Flaherty, Serco's managing director for Caledonian Sleeper, said: "Our northbound Lowlander service into Edinburgh Waverley this morning overran the platform, due to an earlier operational issue at Carstairs.
"An investigation is under way into the cause of the incident, but early indications are that there are no technical problems with the rolling stock. We have notified the relevant authorities.
"As a result of the delay guests disembarked at Edinburgh Waverley at around 08:45 and we're sorry for the effect this delay had for our guests.
"We anticipate that services will run as normal tonight."