The depot is operated by Great Western Railway and has an allocation of diesel multiple units.

[3] New facilities were provided at the depot in 2011, including a new fueling point, and also jacks so that DMUs do not have to be sent empty to Bristol when they require lifting.

[7] The new depot building which opened in 2021 has a three-storey block accommodating staff and their facilities opposite platform 6 of St Davids station.

[7] The depot's fleet of DMUs at the start of 2010 comprised 74 coaches formed as:[9] The Class 142s had been based here since December 2007, on lease from Northern Rail.

[4] The Class 143s were transferred from St Philip's Marsh to Exeter in December 2008, but three of the units worked in the Bristol area each day for several years on services on the Severn Beach Line and the Bristol to Taunton Line, returning to Exeter every other day for servicing.