The Caledonian Sleepers were operated under the stewardship of First Scotrail using DB class 90s until the evening of the 30th March 2015. The final full night of DB class 90s on sleeper services ceased on the evening of the 30/3/15.
From the 31st March 2015, sleeper trains were operated by various traction types's including class 90s.
The core sleeper services of 1S25, and 1M16 are usually worked by Freightliner class 90s at least for the time being. See below for more information.