Branchlines offer the Dapol version of the old Airfix kit with a kit chassis, could it be built from one of these? If so worth contacting them to see what spares might be available. http://branchlines.blogspot.com/
(Alternatively someone may have used the chassis from a Bachmann 04 inside a Airfix or Dapol kit body, the Bachmann uses a split chassis; but they would have had to have modified it as otherwise the prominent 'BACHMANN' moulded onto the keeper plate would be a rather big giveaway!)
(Alternatively someone may have used the chassis from a Bachmann 04 inside a Airfix or Dapol kit body, the Bachmann uses a split chassis; but they would have had to have modified it as otherwise the prominent 'BACHMANN' moulded onto the keeper plate would be a rather big giveaway!)