Another failed government policy regarding rail: the requirement for cleaner locomotives. The vast majority of railroads in the US do not buy new locomotives, a

Another failed government policy regarding rail: the requirement for cleaner locomotives. The vast majority of railroads in the US do not buy new locomotives, and in fact usually use locomotives from the 60s and 70s (bought secondhand). Yet, the federal government is requiring newly bought locomotives to have cleaner emissions. Given that most emissions are from yard switchers (again, old locomotives no longer used in long-haul service), this makes no sense...