Here is the problem I had with one of my Mount cars.
Weight was shifted in assembly.

And here is the light issue.
I see now it is not the LED. It appears to be the light pipe going up to the red lenses on the side.
Maybe they did it this was to light up the interior.
Maybe it would look less odd if the end was filled with some people.
And fully painted furniture.

But the cars are fabulous.