At Beamish shortly after repaint, June 2016
|Original Railway||French Army|
|1925||Arrived on F&WHR|
|1957||Rebuilt with pony truck|
|Length||17 ft 6 in|
Moelwyn Is a 2-4-0DM Diesel locomotive built for use by the French during the First World War. It was acquired by the FR in the 1920s and has worked there ever since.
1918-26: USA to France to Wales
Built by Baldwin Locomotive Works of Philadelphia in 1918 (possibly Builder's number 49604), this locomotive was an 0-4-0PM built for service in Word War I with the French Army. It was purchased in February 1925 for use on the Festiniog and also the Welsh Highland through Honeywell Brothers, the agents used in the purchase of the Simplex - at what seemed to be a bargain £248 13s 4d. Put to work shunting at Minffordd and together with the Simplex it was used for a short time to replace horse traction on part of the Croesor Tramway. It proved too heavy for the light track there and was returned to shunting duties. The need for economical winter services led in 1928 to the Baldwin being fitted with vacuum brakes for service on the Welsh Highland. Although no records are known to survive as to its actual use it probably was used on the WHR and it was certainly used as a rescue engine for passenger trains on occasion.
1920-40: Troubles and disfavour
However the Baldwin had feet of clay. Probably unbeknown to the Festiniog the American Society of Civil Engineers had in 1920 severely criticised the design. The actual petrol motors, mostly built by the Pittsburgh Model Engine Co, needed frequent repairs to the point where the Army engineering regiments asked for new motors. There were also problems with clutch and gear cases. The poor spring design was also criticised as were the long overhangs which made its riding lively at service speeds. The Baldwin had became much worn and broke an axle in April 1929. It was criticised for heavy fuel consumption in the autumn and had a heavy motor overhaul that winter. Not as popular as the Simplex it seems to have been increasingly confined to the shed after Colonel Stephens' death; however it was used up to December 1940 from the drivers' records of the time.
1954-66: Repairs and redemption
The original engine was beyond repair by 1954 and in 1956, Moelwyn was re-engined with a Gardner 3LW diesel engine. In 1957 carrier wheels were added at the front, with a front extension of the frames including parts of an ex-German bogie wagon's bogie frames (from Brookes Quarry), Little Giant's connecting rods and part of Little Giant's buffer beam in the rear engine mounting, making Moelwyn a 2-4-0DM and a more stable runner. Prior to this it had been close coupled to Old No. 1 van to steady its riding. In 1957 Moelwyn also received a four-speed gearbox (Meadows) which was coupled between the engine and the original two-speed gearbox giving eight gear combinations. In this rebuilt state it was described by Fred Howes as a slug, but in 1966 it was fitted with a Gardner 4LK with a big improvement in performance.
1960s: Diesel mainstay
It became a valuable mainstay both on engineering trains and as a back up passenger locomotive. In the 60s Moelwyn was much more intensively used than Mary Ann (the old Simplex). According to the Festiniog Railway Magazine by the end of 1966 Moelwyn had clocked up 16,446 miles "under the present administration" but Simplex Tractor only 1,502. In the 1960s Moelwyn was used by Paul Dukes almost as his personal transport and he regularly commuted from Minffordd to Boston Lodge on it. Paul Dukes also usually drove Moelwyn (with a smile on his face) when it hauled the breakdown train to rescue service trains with steam locomotives in difficulty.
Late 1960s on: Departmental engine
In the late 1960s it was acquired by PW Department.  While in use by the PW Department the carrying space in the new framing at the front often contained spare tools such as shovels, mattocks and crow bars, giving the locomotive a uniquely utilitarian appearance (as can be nicely seen in the second photograph below) which it has lost in recent years. It had an advantage over other diesels available to the PW Department at that time of being faster and thus able to fit in to the timetable between passenger trains.
After 1998: In heritage fleet
The locomotive returned to the FR in August 1998 after a lengthy restoration in England, and now forms part of the Railway's heritage fleet. The name was derived from a typical FR play on words, "Moelwyn" being the name of the mountain rising north of Tan y Bwlch; Moel means bare hill, but can be read as bald, so FR "Welsh" gives the translation of Baldwin!
In 2009 Moelwyn entered Boston Lodge works for a major overhaul, including work to its motion, engine and wheels as well as a re-paint in FR Maroon, after many years in green. It has been fitted with a new pony-truck following an appeal by the Ffestiniog Railway Society. On the weekend of 5th & 6th July 2014 Moelwyn starred at the Welsh Highland Heritage Railway's Slate, Steam & Sail event.
In 2016 Moelwyn was repainted into a grey livery to represent its first world war condition. In this state it visited P'tit train de la Haute Somme in France with The Simplex during the first week of May. They also visited the Tracks to the Trenches event at Apedale on the 13-15th May before going on to Beamish for more first world war themed events.
Moelwyn on permanent way duties in Minffordd Yard 31 October 1981