You see, the train doesn't stop at Tucumcari.
5 seconds sound clip from the For a Few Dollars More movie soundboard.
You can hear this line at 00:05:18.983 in the Blu-ray version of the movie.
Quote context
[...]
- We should pass there in about three or four minutes.
- Thanks.
- Excuse me, but you've made a mistake, Reverend.
- I couldn't help hearing you're going to Tucumcari.
- I peddle goods around here, and I better tell you you're on the wrong train.
- You see, the train doesn't stop at Tucumcari.
- This train'll stop at Tucumcari.
- Why'd you stop? Something gone wrong?
- Somebody pulled the emergency cord.
[...]