Question

why did the train wheel make a ratting sound when it was crossing the river​

Answer 1

Answer:

Squeal is presumably caused by the lateral sticking and slipping of the wheels across top of the railroad track. This results in vibrations in the wheel that increase until a stable amplitude is reached.

Answer 2

The sound is generated because of the lateral movement of the wheels and subsequent connection/friction with the tracks. Train noise is vehicle noise created by trains .