37138 passes Tondu Signal Box on 28 July 1991 with the Pathfinder Tours 1Z81 06:28 Liverpool Lime Street to Onllwyn 'Vulcan Valley Venturer' railtour. The train is returning from Llynfi Junction (Maesteg), and would now diverge to the left towards Margam. 37201 can just be seen on the rear of the train. The line diverging to the right leads to Pontycymer Colliery.