No use looking anywhere nearby a railroad or any kind of road at all, for that matter, because construction engineers make it their business to examine every bit of ground around the road while they build them.
8 seconds sound clip from the The Treasure of the Sierra Madre movie soundboard.
You can hear this line at 00:21:50.377 in the Blu-ray version of the movie.
Quote context
[...]
- How come you're putting up for me?
- This is an all-or-nothing proposition, ain't it?
- We'll buy our burros here at Perlin, then head northwest away from the railroad.
- Echense al piso pronto! Mi valija! Andale!
- I got 3 of them. Credit me with 3.
- I'm one up on you. Bet I got more than you did, pop. I got 3. Nice shooting, eh?
[...]