Skaran wrote:How much work does it look like would be needed to turn the Bachmann O4 into an original GCR 8K as it may have run in 1912?
A fair amount. Others may add points to this list, but as well as the tender:
Change to parallel front buffer sockets
Ensure wheel and handle on smokebox door, not twin handles
Top front lamp iron to Smokebox top
Change to Robinson chimney
Delete snifting valve and possibly fit evidence of Robinson draught retarder gear
Possibly fit top-feed
Change to taller dome
Change Ross pop valves to four column Ramsbottom, open, individually cased, or in combined casing.
Whistle to cab roof
Add GCR cabside number plate
Change to black with red and white lining
Add piston tail rods
Delete double steps from slidebar bracket and possibly add rudimentary single step to same
Fit new steps to mid-way along running plate
This is in addition to correcting any errors of pony truck position, cylinder/slidebar angle, missing bolt heads, bent connecting rods, shape of running plate edges above cylinders, cumbersome loco-tender coupling, etc etc if these annoy you.