What other things besides a TRAIN line up and clip together???

Question

I'm doing a project for school and can't think of anything that lines up like a train. Help!

Answer 1

I don't know if they really do this - but there is the traditional image of elephants lining up trunk to tail.

Answer 2

Some big rigs have multiple trailers. Some buses can add sections. Trolleys. Grocery carts when they collect them. Sled dogs. Some horse carriages.

Answer 3

A puzzle, links like in a chain,magnets