The route as given above.
Not too certain how well that track is maintained now.
Will you be travelling from Low Moor station. Merrydale Road* will cross under the M606 and onto the industrial estate.
Oakenshaw to the Euroway
East under the M606, junction of Cleckheaton Road - Bradford Road. Headed for the school, and the first left after it. Will get you in at the southern end.
Continue past the school, up Mill Carr Hill Road will bring you to where the "compass" is on the picture above. Left onto Boy Lane, then left on to Rockall Lane.
*That's the road at the bottom of the above route