Surely Goole is long enough for 4 already?
As for Normanton, the to Leeds platform needs to become the to Wakefield platform and a new to Leeds platform and running line need to be built and do away with that ridiculous island platform and 35 mph speed restriction. This route could become a regular trans Pennine route with a stop at Wakefield Kirkgate in the same time as via Dewbury if the route was updated to 100mph where possible especially from Normanton and Ravensthorpe.
It will mean altering the 20mph slack on the Up fast at Horbury Junction and building a new alignment through the middle of the disused Healy Mills freight yard.
If you were going to run that way to York, you'd be better off stopping at Normy and Cass (not to mention Sherburn) to provide increased travel opportunities.