I worked at a place that provided services to railroad owners. This was back in the 90s, but they had camera rigs on engines that would record multiple angles along the train routes. They would store that footage in massive tape libraries to be used as reference to see the terrain in an area that service was needed to they'd know what kind of equipment would be necessary as well as a visual of the tracks themselves. They could not update the footage as fast as they liked. IIRC, footage was over a year old before getting updated.
Just another suggestion of a sector you could gain traction as it wasn't listed.
Just another suggestion of a sector you could gain traction as it wasn't listed.