Shunting means moving a train or railway car from one track to another.
Shunting is a part of making sure trains go where they need to go. It's like when you move your toys from one place to another.
Examples:
The train is shunting the cars to a different track.
The workers are shunting the train cars.
She is shunting the train to the other track.
The little engine is shunting the big cars.
The train is shunting the cars very fast!
I like shunting the toy cars around the track.