It seems like they're on the wrong track.
4 seconds sound clip from the Some Like It Hot movie soundboard.
You can hear this line at 01:17:15 in the DVD version of the movie.
Quote context
[...]
- Hmm. I seem to be out of gas.
- It's sort of funny, you being out of gas. I mean, Shell Oil and everything.
- It seems to be stuck in reverse.
- I just got this motorboat. It's an experimental model.
- It seems like they're on the wrong track.
- Do you mind riding backwards? It may take a little longer.
- It's not how long it takes. It's who's taking you.
- Yes.
- It looked so small from the beach, but when you're on it, it's more like a cruiser or a destroyer.
- It's just regulation size. We have three like this.
- Three?
- My dad's more interested in railroads. Baltimore and Ohio.
[...]