OO Gauge Hornby Wagon Coupling Type: NEM Tension Lock H.W. Snow & Sons were coal and coke merchants based in Wallingford, Oxfordshire. Their wagons featured the distinctive diagonal red lozenge and transported coal from the GWR main line at Cholsey along the branch line to Wallingford for transfer to road. This charming 5 Plank Wagon model beautifully replicates one of their fleet, bringing coal freight to your model railway layout.