Youtube Some nice shots of the narow gauge Welsh Highland Railway

[fred lundgren]

https://www.youtube.com/watch?v=W_x8DiMa7xA&feature=em-uploademail

[ebtnut]

Some nice stuff there.  Really highlights the difference between the Fairley and the Garrett.  The Fairleys (the first loco seen in the video) are essentially two complete locomotives joined back-to-back.  The Garretts are two engines under one boiler, akin to more conventional articulateds.  I rode the Festiniog some 30 years ago.  IIRC, the motive power was a 2-6-2 former trench engine.  Still think Bachmann should seriously consider doing a Garrett in On30.