5 inch gauge LMS Duchess "Sir William A Stanier FRS" - stock code 7156

A 5 inch gauge "Duchess", an older engine which came in recently as part of a collection, including an award-winning 9F in the same gauge, as the owner moved to 7 1/4 inch gauge.

Silver soldered copper boiler, four element radiant superheater, 90psi working pressure, four safety valves, feed by twin injectors with auxiliary hand pump in the tender. Cast iron cylinders with piston valves - the outside valves actuated by Walschaert's gear with screw reverser in the cab, the inner valves by rocking shafts. Dummy Wakefield lubricators on the running boards, the mechanical lubricator is buried between the frames (which is no mean feat on a four cylinder engine), it's filled from one of the dummy axlebox lubricators.

The engine runs well, slight blow on one piston valve although not noticeable at speed, injectors pick up cleanly. Firing requires some concentration and deft use of the shovel - as in the full size engine it's a large firebox that needs to be covered for the engine to steam well.

There's some video of the engine running on the rolling road here.

Length
Locomotive 54 inches
Tender 27 inches

Boiler number N36 90 131 90
Builder Non-commercial
Date of manufacture 1982
Construction Copper, silver soldered
Working pressure 90psi
Hydraulic test, test pressure/date tested 135psi, 12-Sep-2016
Steam test 15-Sep-2016, valid to 14-Nov-2017

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