The station also included a loading bay and single siding at its southern end accessible from the northbound line.This line diverged from the DNSR on the north side of Chesil Tunnel, and was worked by the Railway Operating Department of the United States Army.The shed housed a single line of rails, and there was a water tank above the northern end; to the south were a small coal stage and a turntable.It lasted until around 1933[10] before replacement by an orthodox lever frame giving mechanical control of points and signals – it is believed[weasel words] that the damp conditions of the surrounding area (Chesil station lay partly in a cutting next to St. Giles Hill) caused problems with insulation of the wiring, the installation dating from a time before modern plastics like polythene and PVC were available for use in electrical insulation.[citation needed] The route-setting signal box was only a small scheme and effectively a testbed for a pair of similar but larger installations undertaken at Newport High Street station in South Wales, also during the 1920s.