I've got a Wrenn Class 20 which was never a brilliant runner. I've done a lot of work on the body and have been thinking about putting a new chassis under it. Does anyone have any idea whether the Wrenn body might fit onto a Bachmann or Hornby Class 20 chassis?
Ahh... but my Wrenn body has two cabs, has been repainted, glazed etc... It took a ages to turn it into a BNR heavy freight loco and so it has no collectable value. It also has a lot of sentimental value :)
: : Ahh... but my Wrenn body has two cabs, has been repainted, glazed etc... : It took a ages to turn it into a BNR heavy freight loco and so it has no : collectable value. It also has a lot of sentimental value :)
Then I suggest a Bachmann chassis..... of North American outline!
To get back to your original question, here's a general comment, based on my own experiments in fitting ancient bodies to new chassis.
The critical factor is scale dimensions. IF all three engines are scale length and width, then fitting the Wrenn body to a Bachmann or Hornby chassis is only a matter of chopping a bit of plastic here and adding a bit of plastic there so that the Wrenn body slips over the new chassis and rests at the right height. Same if the Wrenn body is slightly long. But if the Wrenn body's short, you can't do it without surgery on the chassis, which IMO is not advisable.
Tip: clean all bumps, pegs, mounting tabs, etc out of the interior of the original body. Makes it easy to add new mounting tabs, rearrange interior lighting, etc.
: Was the wrenn tooling taken over by Hornby or Bachmann? : If so, an older model may be a closer fit.
As I said in another reply, Wrenn took over the old Hornby-Dublo tooling, so that models ancestry goes back 50 years! I suspect that much hacking and bodging will be needed to get a modern (can motor) chassis to fit, better luck might be had with the older Lima class 20 chassis if one can live with the old Ringfield type motor-bogie drive. Failing that, if a modern can-motor > cardian-shaft > bogie drive is needed then one might have to use Bachmann/Hornby bogies with scratch build a chassis frame IYSWIM.