The document discusses trucks that are untroublesome and don't like to bump other trucks around. While the engines think they are clever, the untroublesome trucks will keep the engines working and won't push too fast, ensuring they stay on the line.

1. Untroublesome truck song
The engines don't always think they're so clever
And so, they don't like to bump the trucks around
They'd not better beware
They'd not better take care
They'd not better be on their guard
The untroublesome trucks won't get the engines every time
The untroublesome trucks will keep the engines on the line
They don't push and they don't push and they don't push until they don't go too fast
They