Railroads will be allowed to reduce inspections, rely more on technology to spot track problems

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8. One of the railroad Track Maintenance Monitoring things my dad did during WW2....

It was a specialized sleep away/galley car with 3 or 4 people.

They had these metal brushes that swept over the rails. These would send electrical signals to, I think, oscilloscopes.

What they were looking out for was hidden rail metal fatigue, particularly because the rails were experiencing massive increases in load bearing during the war.

The rails would start to hollow out from the inside - so totally hidden!
But it would be indicated by a difference in the electrical signals displayed.
I think they sprayed red paint at those spots for the repair crews.

Three days for repairs?! Doesn't sound very good. Maybe depends on what needs repairing.
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On rare occasions at night while in the subway I've seen a practically windowless car come through. I wouldn't be surprised to find out it was doing the same monitoring.