Haven’t thought about that but….There’s no way this country could operate without railroads for an extended period of time. We could figure ways around it in the long run but machinery that move freight long distances are few and far between: over the road trucks wouldn’t be a solution, they’re already occupied. Pull retired engineers in for service to run the trains? Teach others to do the job? Who would train them? It would be a disaster I’d say. Part of that is our “last second supply chain” as you saw during lockdown and after….take 100K blue collar workers out of work and watch what happens, then do the same thing worldwide…..we’re still seeing the effects of that happening from people dying or quitting shitty jobs….microchips for example, China gets overwhelmed with Covid (and other reasons) and there’s a chip shortage in a few weeks….now Toyota is two years out from delivering your new XYZ model. But…..moving freight is a matter of national security and I would hope there’s a solution already in place if all the locomotive operators quit at once… We’re a resilient bunch of people, traditionally… I hope we still are. (Army Corp comment was a play on words, see wiki link below for their actual function if you don’t already know) Have fun, be safe!!!!

https://en.m.wikipedia.org/wiki/United_States_Army_Corps_of_Engineers