Boxcar 1:87 (H0)

Russian boxcar "NTV", widely used from 1880s till 1940s.

Note: roof is designed to print it vertically. After printing, cut off the flat support part.

The same boxcar in 1:200 scale: https://www.thingiverse.com/thing:2797314.
Simplified (easy-to-print) version: https://www.thingiverse.com/thing:2966862.