According to the Wikipedia entry for the West Riding and Grimsby Railway:I can't think so - what purpose would that serve? There is an established diversionary route from Doncaster via Askern and Knottingley to Ferrybridge.
Come to think of it, what purpose did it serve historically?
Almost certainly not because the movement it serves was catered for by the North Doncaster Chord at Joan Croft junction.Does anybody know if Network Rail have proposals on reinstating the missing chord to the West of South Elmsall where the Moorthorpe line passes over ?