WORKERS on the Caledonian Sleeper will strike against the “intolerable personal stress” caused by management backtracking on promises to improve workplace conditions, their union announced yesterday.

RMT members working on the service will walk out from Sunday September 29 until Tuesday October 1, as well as not working any overtime, rest days or performing higher grade duties from October 2 onwards.

Workers are angry that Serco, the company that operates the service, has reneged on its commitment to dealing with a variety of staff concerns.