If it wasn't for the train, we could set a time fuse and be miles away.

4 seconds sound clip from the The Bridge on the River Kwai movie soundboard.

You can hear this line at 02:04:24.515 in the Blu-ray version of the movie.

Quote context

[...]

- Not like the temporary bridges the enemy usually throws together. Look.

- Those poor devils down there. Imagine being forced to build something like that in the condition they must be in.

- They've got a British officer working down there on his knees.

- The Japanese seem to be enjoying it too.

- If he knew we were here, it might boost his morale a little.

- If it wasn't for the train, we could set a time fuse and be miles away.

- Since we don't know what time it's going to cross tomorrow morning we'll have to do the job manually.

- We'll set the charges against the piles about three feet under the water, I should think, and run the main wire downstream to the plunger.

- The problem is where to hide it.

- Our side of the river is quite obviously used by the Japanese. They'd spot it at once.

[...]