A Martin Evans designed 12-sheet plan for a 5" gauge version of the powerful 2-6-2 gauge tank locomotive 'Firefly'.

This 12-sheet plan consists of:

Sheet 1 General arrangement of engine and main frames.
Sheet 2 Buffer beams, leading and trailing pony truck stretcher.
Sheet 3 Coupling rods, connecting rods, leading and trailing pony trucks, brake details.
Sheet 4 Cylinders, steam chests, valves, pistons, cylinder covers, crossheads, crosshead pump arm, slide bars, gudgeon pins.
Sheet 5 Motion plate, eccentric rods and straps, valve gear details.
Sheet 6 Valve gear assembly, reversing gear, cylinder drain cock assembly.
Sheet 7 Crosshead pump and details, lubricator for coupled axles, exhaust arrangements, combined clack and tee, steam pipe and oil check valve, details and assembly of steam and hand brakes.
Sheet 8 General arrangement of boiler and boiler details.
Sheet 9 Smokebox and saddle, regulator, blowdown valve, layout of cab, details of firedoor, oil delivery pipes.
Sheet 10 Grate, ashpan, superheaters, arrangement of smoke-box, smokebox and details, petticoat, snifting valve, manifold, buffers.
Sheet 11 Platforms, side tanks, cab and bunker sides, tank tops and details, sections through tanks, arrangement of hand pump and feed clack.
Sheet 12 Bunker water tank, cab roof and rear spectacle plate, chimney, safety valve cover, buffers and couplings, final details.

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