This yard, located adjacent to Severn Bridge Junction at the southeast end of the station, is currently used for the stabling of DMUs by Transport for Wales and West Midlands Trains.

The original locomotive servicing depot was built on the opposite side of the tracks to the current TMD, by the Shrewsbury and Hereford Railway (S&HR) in 1856, consisting of a single-road straight shed.

As part of their joint-purchase of the S&HR, the Great Western Railway and the London and North Western Railway agreed to build a new six-road shed on the same site, designed using LNWR architecture principles, utilising the original S&HR shed as a wagon repair depot.

In 1877 the LNWR built a new ten road shed of their own to the south of the site, closer to the running tracks.

After the GWR absorbed the constituent railway companies in the area, in 1883 they built a new roundhouse to the rear/east of the existing former joint facilities, and added their own coaling stage.