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Double Tich Locomotive
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mcr:
Ken Swan is the main man at Beamish Museum the club members are building a railway I would say rather than a track.
He builds in 7 1/4 " and the quality of his models and drawings are top draw. A friend of mine is building the Wren using Ken's drawings and castings he is very impressed.
NickG:
That Wren looks much like Sweet William (7 1/4" gauge version of the sweet pea I am building) that will be a huge engine! I was tempted to it by the relatively simple boiler construction and things such as hackworth valve gear which can be seen in your pic.

Nick
Brass_Machine:
Looking good so far. Nice, clean work.

Either my eyes are fooling me or that Wren is pretty big. Not really sure how big 7 1/4 gauge is....

Eric
kvom:
7-1/4 refers to the spacing of the rails.  Scale defines how large the loco is wrt to a full-size prototype.  Typical scales for 7.5" gauge are 1.5, 1.6, and 2.5.  1.5 scale means 1.5" to 1 foot, or 1/8 size.  1.6 is slightly larger, and some prefer it because that's the ratio of the 7.5" model gauge to the 56" gauge of standard railroad tracks.  Using 1.6 makes the model/track relationship more exact.  Models in 2.5" scale are really massive, but can pull quite large loads.
mcr:
Some might find this link interesting:
http://www.bmeg.co.uk/
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