It's been laying upside down at the bottom of a grade along with two flatcars, ever since timber trains ran in this country and that's a hell of a long time ago.
11 seconds sound clip from the The Train Robbers movie soundboard.
You can hear this line at 00:48:21 in the Blu-ray version of the movie.
Quote context
[...]
- I'm not talking about the train.
- I'm talking about the half of million.
- You wouldn't catch me hiding that much gold in the boiler of a six-wheeler!
- I'll believe that when I see it.
- Wonder whatever happened to that old boy.
[...]