=>Are you saying that the relevant manufacturers are correct in producing =>inaccurate models and/or that they can produce such models but that they =>can't produce their models to the correct measurements, contours or =>colors.....
What measurements are off? By how much? Can you tell without measuring the model? If you didn't _know_ it was off by a millimetre here and a millimetre there, would you notice?
What details are off? Have you got photographic evidence that all engines of this should or should not have some detail? That this engine never did or always did have some detail? Etc.
Contours - the angle of view affects these in ways that are surprising, to put it gently. IOW, an accurate model may not look right to you simply because you are not an OO size person -- and setting photos side by side won't work as "proof", unless the camera has exactly the same angle of view for model and protoype - not easy to achieve.
As for bodies and mechs -- that's the main source of dimensional errors in models, which will be too long or too short for a very simple reason. In a small market such as the UK, mfrs will try to save costs by marrying different bodies to the same mech - if the difference in wheelbase is within "acceptable" limits. Bodies will be lengthened or shortened to suit. You could have exact models of all versions of a the 37s if you want - at couple hundred pounds or more each.
As for colours --- under what lighting conditions are you viewing the model? Change from incandescent to fluorescent, change to different fluorescents, change the wattage in the incandescente, etc etc and the colours will look different. Change the room colour - a warm white room will make colours look different than cool white one. Do you have shades over the lamps? If so, they will affect the colour (not to mention the inetensity of the ight, which also affects the colour.)
In "real life" sunshine and cloud, not to mention the effects of wind and weather and dirt of all kinds on the paint itself, all influence the colour. I've seen photos of the same engine taken at the same time by two different people on the same film - but the pictures showed different colours. Which one gets the prize for accuracy? I have photos of the same engines taken at different times and places - they're all different in colour. Oh, the colour scheme's the same, but the actual tones of the colours vary, sometimes quite a bit.
Then there's the superstition that if you get actual paint chips and match them you will get accurate colours. Not in the typical layout room you won't- lthe light source is the wrong colour, and too dim besides, so that "real" colours will look way too dark, and if the lighting is incandescent, the blues and greens especially will be off.
And so on.
OTOH, I do expect the numbers to be accurate. :-)
Wolf Kirchmeir ................................. If you didn't want to go to Chicago, why did you get on this train? (Garrison Keillor)