 In some cases, both companies ran vehicles over the same route, which were identified differently depending on who owned the particular vehicle.Thus Mexborough vehicles running between Conisbrough Low and Rotherham were running service "B", while Rotherham vehicles plying the same route were running service "9".The fleet was augmented in 1937, when six second-hand vehicles manufactured by English Electric were purchased from the Notts and Derby Traction Co, and again in 1942 when six 3-axle vehicles made by Guy Motors arrived from Hastings, although not all of this last batch entered service.