NG/G16 Beyer-Garratt No.143 passes between Tunnel 2 and Tunnel 3, as it heads south through the Aberglaslyn Pass - where road, river, hiking trail and rail run side by side through the narrowing gorge of the Afon Glaslyn - on the newest section of the Welsh Highland Railway, from Beddgelert to Hafod-y-Llyn. This latest extension means that WHR trains now run 19½ miles from Caernarfon, up and over the foothills of Mount Snowdon, to a temporary run-round loop south of the Aberglaslyn Pass...