Trying to work out a scenario for Resistance to attack a German railway gun. The railway guns were usually positioned by a diesel loco, so I opted for the old Dapol/Kitmaster 0-6-0 BR Diesel kit. Its sort of about right - and will do as a game piece.
The railway gun and diesel loco (actually OO/HO), more suitable for 1/72 - but as backdrop items they don't look to out of scale with a German sentry 28mm figure.