I attempted to draw what might have been the layout of the GR&I at the Walton station. Please keep in mind that I have not seen a drawing of Walton. How close is this to what it once was?
2015 imagery at Walton / Walton Junction. Dark red is current, bright red is my speculation of GR&I layout, Dark purple is the M&NE River Branch, Light purple is M&NE interchange.
A closer view around the Walton Station