Train Go Under the Water

Trains Go Under the Water
Ben wants to know why trains can go under the water. He asks his uncle, "ls the train travelling in the water?"
"Not really," says Uncle Jim. "People build a tunnel to keep the water away from the track. And trains travel on the track in the tunnel."
Then Ben asks,"Can you take me on an underwater train ride one day?" Uncle Jim says, "I would love to!"