| ▲ | JackFr 10 hours ago | |
Railroad cars don't have differentials and travel on parallel tracks. How? https://www.reddit.com/r/Skookum/comments/47sbri/richard_fey... | ||
| ▲ | pixl97 6 hours ago | parent [-] | |
For those that don't read the link, by having conical wheels. | ||