flangeway

noun2

1. •
   The gap in road surfaces, running rails at rails at junctions, etc, that allows the wheel flange of a rail vehicle to pass.

   • The factors in determining the width of flangeways between check rails and the main rail are the thickness of the wheel flange and the clearance allowed […] — 1895
2. •
   (historical) An early type of railway that used flanged rails rather than flanged wheels.