Inside valve gear

Posted on June 15, 2016. Filed under: Project progress |

I made the original 57587 in 2002 from a very poor Skinley drawing, rebuilding the body around 2011 and 2012 and giving the loco a new, twin-beam compensated chassis with the correct wheelbase (see “Rolling Stock Gallery”). In between waiting for the many thin coats of paint to dry on 54458, I took the opportunity to add more detail to 57587 and to provide a representation of the valve gear, which is very noticeable between the boiler and the upper frames.

Fortunately, back in the 1990s, I photographed between the frames of the preserved 57566 on the Strathspey Railway. The key visual elements are the weigh shaft, rocking arms and balance weight, and the reversing arm and operating lever. Unfortunately, these are very close to where the twin beam compensation components are situated.

57587 Valve Gear 1 160615       Squeezing in the valve gear

The weigh shaft and rocking arms sub-assembly is a spring fit between the outer bearing housings to give access to the compensation beams underneath, which have notches filed to give clearance for their movement. The gap between the nearer housing and the loco frame (cut away at this point) is created to accommodate the reversing arm, which, with the operating lever, is attached to the loco body. A consequence of this is that the upper frame between the splashers on this side of the model is attached to the body, and on the other side is part of the main frame.

57587 Valve Gear 2 160615       Looking between the frames

The view under the boiler is now suitably “busy”, and the small gap between the end of the weigh shaft and the reversing arm is hidden.


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Reblogged this on sed30's Blog.

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    The epic struggle to build a model railway exhibition layout at 4mm to the foot


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