 However a branch from the P&DR to Marsh Mills, crossing the River Plym.The branch opened on 20 November 1829 or 20 January 1830

Lord Morley had interests in china clay (kaolinite) deposits on Lee Moor, and in 1833 he agreed with the Johnson Brothers that they would build a branch line to Plympton largely on the northern margin of the Exeter Turnpike.China clay was to be brought down from Lee Moor by packhorse to Plympton.