I kid you not, I attempted to convert a Triang Hymek to P4. Why? because the body is actually close to scale and didn't take too much work to look half decent with wire handrails and SE Finecast flush glazing. The chassis was an entirely different matter. The biggest problem is that the Triang bogies are only a scale 8' 6" long - the prototype had 10' bogies. My solution? Bodge in the power and trailing bogie from a Lima 'Warship' and stretch the cosmetic bogie side frames. Not using the original couplings allowed me to model the air tanks under the ends (a very prominent feature). Still waiting the stainless steel numbers - this will be D7000, the doyen of the class, which uniquely had the buffer beam surrounds painted black - all the rest they were the light shade of green. I'm very happy with the conversion, she runs surprisingly well!

Firstly a side on view - sadly the silver paint on the vent frames is wearing off already

Then some cruel enlargements of a 3 quarter view:

a front on view with all the pipes and air tank