Shunters are people who move train cars around in a train yard.
Shunters are important for making sure the train cars go where they need to go.
Examples:
The shunters move the train cars from one place to another.
The shunters work hard to keep the train yard organized.
The shunters wear special clothes to stay safe while they work.
The shunters make sure the train cars don't crash into each other.
The shunters have to be very careful when they move the heavy train cars.
The shunters are like the traffic police for the train yard.