Question

What is it that holds the train boxes together?​

Answer 1

Answer:

ANSWER IS THIS.

1. They are then linked together by an automatic coupler, consisting of: mechanical systems to ensure the connection between the two trains, pneumatic ducts to guarantee continuity between the two trains, and finally, electrical connector heads to allow both trains to be controlled from a single cabin.

Answer 2

Answer:

A coupling or coupler that holds the train boxed together ...

Explanation:

It connects to the following car by which succeeding cars in a train are linked