Moss Bay Cart Siding was used for two periods as a temporary northern terminus for workmen's trains to Lowca.
It was situated where Moss Bay Road crossed the CWJR's Derwent Branch in southern Workington in the former county of Cumberland, England, which is now part of Cumbria.
The service was moved from the Cart Siding to start at Workington Central at some time before July 1913.
The second period of use began on 11 July 1915, when two Sundays Only workmen's trains commenced running to meet exceptional wartime need.
The track past the siding remained in use to serve Wilkinsons Wagon Works until 1962.