Moel Tryfan was a narrow gauge steam locomotive built for use on the North Wales Narrow Gauge Railways (NWNGRs) in 1874/5. The locomotive was an 0-6-4T single Fairlie locomotive built by the Vulcan Foundry near Manchester.[1] It spent its entire working life on the NWNGRs and its successors the Welsh Highland Railway (WHR) and the Ffestiniog Railway (FfR).