Built of local red brick and costing £28,000, the locomotive erecting shop had a central traverser which was hand-operated, serving 12 roads on each side. On the far north end of the works, 11 sidings accessed a carriage and wagon works. Power to the machines was provided by a large steam engine via overhead shafting and belts. The chimney is still a local landmark. Whilst many carriages and wagons were built in the workshops, only two locomotives were actually constructed at Oswestry. After the Cambrian Railways was taken over by the GWR on grouping in 1923, the GWR kept the works open as a regional carriage and wagon works, and locomotive repair shop for the associated locomotive shed.