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WW1 War Department 2 foot gauge Baldwin
WW1 War Department 2 foot gauge Baldwin Narrow gauge
About this creation
The prototype

In 1916 the British War Office ordered a variety of locomotives from various manufacturers for use on supply railways behind the trench lines. As the British manufacturers could not build enough locos quickly enough they also placed an order for 495 4-6-0 locos with the Baldwin Locomotive Works of Philadelphia, USA. Another order was placed with ALCo for 100 locos of a similar design, but with a 2-6-2 layout.

Nearly all the locos were delivered by the end of the war and they saw use by UK, Canadian and Australian troops. When the US entered the war they also placed an order with Baldwins, but again with a 2-6-2 layout.
After the war the locos were advertised for sale, but there weren’t many takers. In the UK the Ashover Light Railway in Derbyshire bought 6 while the Snailbeach Railway bought 2. A couple of other were bought by other lines. 50 went to India and some were still in use until the 1970s Another couple ended up in Australia and one is still in use, although with a major rebuild.

The model

Planning for this MOC started with a CAD model over three years ago, long before BBB wheels were introduced. The basic construction and detailing of the body, cab and front footplate have remained from this time but the chassis and cylinder have been completely redesigned. The release of the BBB wheels was the catalyst for translation into the brick.
It was always intended to motorise the driving wheels, more for that sake of it than any thoughts of increased traction. The original plan was to use Jason Railton's 'centre wheels on sprung arms' design with an axle geared to the leading and trailing wheelsets running down the centre of the 1-wide backbone beam, however after reading that some of the real locos had blind drivers on the centre axle I decided to take this far simpler route.
The loco now has a 9v train motor at the front bogie, powered from this is a Technic gear motor (nearly) hidden in the firebox, a headlight and flashing lights in the firebox to represent the fire, the connection for all the wiring is hidden in one of the side tanks.
Making the front bogie and cylinders so that the the loco could go round curves and have the pistons still working was the hardest part of the design. The pistons were based on Teunis Davey's design, however despite seemingly having more room because of the larger scale, the presence of the large block of the train motor means that that cylinders have to be pretty thin.
The motor itself is not actually attached to the rest of the loco, it can slide sideway and rotate. The cylinder unit can only slide sideways, this keeps its alignment with the driving wheels well enough to work.
The final design for the front bogie was actually a halfway stage, I originally thought that the cylinder unit would need some sort of self-centring springing, however a test run showed that it worked so I left it well alone! The use of Technic Connector Toggle Joint Smooth on full length Technic pins seems to give enough play to allow for the sideways movement. The finished loco works on all standard Lego track including points, however it cannot be used with the track power connectors, [edit] instead I have simply soldered a 9V wire with one end cut off to a curved section of track.

And the name? Well on the Ashover Light Railway the locomotives were named after the owner's children, Peggy, Guy, etc. Mine is named after my long suffering Lego-widow wife.

Credits

Thanks go to Tim Gould and Samarth Moray for their encouragement, Ross Crawford for his Technic expertise and Derek Iddison for his nagging!

References

Narrow Gauge at War 2 by Keith Taylorson
Plateway Press - ISBN 0 9511108 1 0

Over Here! Baldwin Military Locomotives in the UK by Lawson Little
Narrow Gauge Railway Society

The Ashover Light Railway by Robert Gratton and Stuart R. Band
Wild Swan Publications Ltd - ISBN 0 9068677 2 X







Enlarge image
   The cab showing the fire which flickers. The detail is not 100% accurate but I was getting bored. The grey lightsabers/bars hold the upside down arches in place.



Enlarge image
   The bogie and cylinder unit. This shows how the cylinder unit can slide sideways.



Enlarge image
   Here you can see the how the front of the loco rests on the front bogie and cylinder unit and allows the motor to pivot and slide and the cylinders to only slide. The Technic gear motor is visible, but I wasn't going to spend a fortune on a black one!



Enlarge image
   The cylinders on the inside of a curve. By a fluke the inside cylinder slides under the front footplate.



Enlarge image
   The cylinders on the outside of a curve. It can be seen that they only need about 3 studs sideways movement.



Enlarge image
   The gearing connecting the wheels. In theory this should prevent the coupling rods from binding, however it probably adds just as much friction as it prevents



Enlarge image
   Front quarter view
Unfortunately my pics make my bricks look very battered :(



Enlarge image
   Rear quarter view
The coiled hose on the rear is the water lifting apparatus for collecting water from shell holes etc.



Comments

 I like it 
  September 17, 2013
One word: AWESOME!!!!!. Please put this on Cuusoo, I could see this becoming a set. It's so detailed, most trains that TLG comes out with have boring looking designs (Except the Emerald Night and the Lone Ranger train, but they are pathetic compared to this) Awesome moc, I'd LOVE to see this on Cuusoo.
 I like it 
  December 11, 2009
One of the best lego NG engines EVER! I really like the idea and the cab. You should try to build one of the engines of the "vale of Rheidol" railway.
 I like it 
  September 12, 2006
That is nice!! I've got to start making some Maine 2 foot stuff. Keep up the good work!
 I like it 
  April 28, 2006
Once again some fantastic work Tim. I especially love the flashing light ;)
 I like it 
  April 28, 2006
Wow, this is all very impressive. You don't see many trains in this scale, and I can imagine how difficult it would be. Also, it's great to see a WWI model. Maybe you could make some Miniland scale soldiers to accompany it? Man, I'd sure love to see it running with the working fire you have going inside. I have one question though. You said it doesn't work with the track connectors. What set-up did you use in their place? Again, wonderful train there.
 
By Tim David
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