If it's the one just after Armley Moor tunnel allowing trains to go on to what would be normally the Bradford line, the Grand Central Train I was on a couple of years ago used it.
Because of works in the Mirfield area, we were diverted from the usual route from Interchange-Halifax-Brighouse via Bramley and this crossover, stopping to reverse past the junction with the Doncaster line. After changing ends, the driver then proceeded via Wakefield Westgate down into Kirkgate and the normal route.