 Whimsey was the terminus of the branch from 1854 until the Mitcheldean Road line was built.The Mitcheldean Road and Forest of Dean Railway was authorised but ran out of money before completing construction, and it was acquired by the GWR.The GWR completed the construction but left it unused for some years, after which they opened the section from Whimsey to Speedwell sidings (6 m 63 ch) in July 1885.