Here's what happened. We're waiting at the depot at Frankfurt. Understand? When an ammunition train comes through the longest ammunition train you ever saw. Understand?

10 seconds sound clip from the Stalag 17 movie soundboard.

You can hear this line at 00:53:49.251 in the Blu-ray version of the movie.

Quote context

[...]

- Where'd they get you, lieutenant? Over Frankfurt?

- On the Schweinfurt run.

- Flack or fighters?

- Fighters.

- How many ships did you lose?

- Hmm. About half the group.

- Flying out of England?

- Yes. Waddington. 92nd bomber group.

- Hey, lieutenant, how'd you blow up that train with 50 guards around?

- Well, I, heh... Just lucky, I guess.

- Don't let him kid you. Cagney couldn't have pulled a sweeter job.

- Here's what happened. We're waiting at the depot at Frankfurt. Understand? When an ammunition train comes through the longest ammunition train you ever saw. Understand?

- Oh, he's just giving it a big buildup. Actually, it was simple enough.

- I just drifted into the men's room, fixed myself up a little time bomb, broke open the window and when the ammunition train started pulling out, I just tossed the thing into an open car. I guess there must have been some straw in there on the floor.

- Yeah. And about three minutes later you can hear it. Boom! Understand? Broke every window in Frankfurt. Understand? It was gorgeous.

- Wait a second. I'm not through. Understand?

[...]