Although I have no idea whether the workings at Haigh extended further than those on the N.E. coast - Ellington,Wearmouth,Easington etc(although I understood their limit was approx 4 miles-is 6 in km. or miles,interesting that the current imperial v metric court case is based in the area-Sunderland,once home to Seaham) I do understand that the manrider at Haigh was allowed to exceed the regulation 8 mph speed and do 15 mph because of the distance to working faces. Also,interesting the Ellington pit pony myth is repeated here so soon after the recent correspondence re. pit ponies(u/ground).Last one left a colliery two years ago. Andrew Santer