But arguably not in "Sweet Wyoming Home": "The rounders, they all wish you well, when they know you're in a jam."

From another song:

Here's to you rounders and here's to you railroad bums
Hope that you make it home soon
Here's to the women who married for love
And lived with the man in the moon

But in counterpoint, there's an implication that those who drove the big-wheel steam engines were also called rounders occasionally:

Come all you rounders that want to hear
The story of a brave engineer.
Casey Jones was the rounder's name,
On a six eight wheeler, boys, he won his fame.

Casey Jones mounted to his cabin,
Casey Jones with his orders in his hand
Casey Jones mounted to his cabin,
And he took his farewell trip to that promised land.


A