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When have trains gone missing?

It sounded nice

There is a movie called closely watched trains which is humorous but not relevant.

Well….

https://www.cbc.ca/player/play/2675415775

These systems are generally never used to solve low-level crimes. When they are, parallel-construction is used to avoid publicizing their existence. These systems are reserved for direct threats to national interests.

Perhaps they went missing when it was cloudy?

wouldn't some IR go through clouds? I thought that was the point of using IR.

That being said, the more important question is, how's the temporal resolution.

From the article: "trained to locate the sources of electromagnetic emissions with wavelengths ranging from roughly 2 meters down to 2 centimeters"

These types of signals wouldn't be obscured by clouds, presumably.

Yes. These systems are for control, not general purpose law enforcement.

Not yet