An unusual 1in. scale for 5in. gauge model of a steam driven railway crane,

An unusual 1in. scale for 5in. gauge model of a steam driven railway crane,
with brazed copper centre flue boiler with normal fittings and main steam line with regulator valve to twin vertical cylinder engine with brass clad cylinders approx. ¾in. bore x 1in. stroke, trunk-type crosshead guides, Stephenson's link reverse, disc cranks, lever operated skew and straight cut gear drive to various crane functions, gear driven main winch drum with chain, lattice jib, load hook, watertank and many other details, finished in black and mounted on a two axle chassis -- 99cm. (39in.) long