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Wtf? So would this be running in service?
Assume you would need review of the video so may as well send in the staff.
Also what about gauging that requires calibrated measurements. Just use an on train scanning system that at least runs a known distance from the ground.Drones sound like another "everyone can get jobs in cyber" solution
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NMT and structure gauging train already do this
https://en.wikipedia.org/wiki/New_Measurement_Train
The one I saw was line checks being done by drone - and the comment that followed was that the author of said comment was uncertain how a drone was going to check whether bolts were loose on points etc, but IDK how real that concern is.
The thing about checking things via drone is that the eyeballs watching the monitor can be in a low-wage economy elsewhere, with no pension, employment rights and so forth.