The Welsh Highland Railway (WHR) or Rheilffordd Eryri is a 25-mile (40.2 km) long, restored 1 ft 11.5 in (597 mm) narrow gauge heritage railway in the Welsh county of Gwynedd, operating from Caernarfon to Porthmadog, and passing through a number of popular tourist destinations including Beddgelert and the Aberglaslyn Pass.

whr map

In order shown below:

Tasmanian Garratt K1 is an 0-4-0+0-4-0 articulated Garratt, one of a pair built in 1909 by Beyer Peacock for the North-East Dundas Tramway, Tasmania.
Seen here with a vintage set of ex. South African wagons passing Pont Croesor with Mount Snowdon in the background.

Double Fairlie 'Merddin Emrys'. In 1869 Fairlie's company built a locomotive, named Little Wonder (Fairlie was not an individual given to modesty) for the Ffestiniog Railway, a slate hauler in north Wales, and proved to be an outstanding success.
Here seen 'Merddin Emrys' and vintage set crossing the cob at Porthmadog station in the dawn early light.
The Cob is a man-made causeway built across the Afon Glaslyn by William Alexander Madocks and opened in 1811.

'Merddin Emrys' on the sharp reverse curves north of Beddgelert.

'Merddin Emrys' leaving the tunnels in Aberglaslyn Pass. (Just out of shot were the sight of 40 photographers clinging to the sides of the cliffs)!!!

'Merddin Emrys' passing Pont Croesor with Mount Snowdon in the background.