Choo Choo

Hello, here's a little .gif from the animation i'm working on in
Cinema 4D about transports (yay!).

I was wondering if any of you found a quick tip (or plugin?) to have the booleans having their faces all "closed" on the side. Right now when some models are intersecting they pop-in as an "empty" :/.

For example on the .Gif, you can see some of the houses appearing "empty".

(Yeah and the gradient BG doesnt work well in .gif..ugh)

Thanks, =)