The primary purpose of the Widnes Deviation Railway was to enable Garston and Warrington line trains to pass over the Widnes and St Helens line without impeding traffic on that route. The origal routes crossed on the level at Widnes Dock Junction which caused much congestion.
As a new Widnes station was provided on the Deviation line a connecting spur giving access to the St Helens line was necessary to allow passenger trains from that route to use the new station. The connecting spur diverged from the main line at Widnes Junction and ran for 13 chains to a junction with the St Helens line just to the south of Ann Street crossing. The spur dropped down from Widnes Junction to the St elens line at a gradient of 1/138. In the space between the spur and the main line the LNWR built the Widnes Locomotive Shed.
From 10 March 1969 the St Helens line connecting spur became the only route that St Helens traffic could take to gain access to Widnes as the original line from Ann Street to Widnes Dock Junction closed (from Widnes Dock Junction to Widnes Dock having closed on 4 November 1968).
The St Helens line closed as a through route on 1 November 1981. Trip workings to Tanhouse Lane via Widnes No.1 ceased to use the deviation spur line from 18 April 1982. From this date they used a new connection to Tanhouse Lane yard direct from the deviation line.
The spur was lifted by the end of July 1982. In the mid-1990s Watkinson Way was built on most of the trackbed of the spur.
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