Smog now required on older diesel coaches

[LegitDuner]

Something tells me they're going to be rolling it back even more...

California Pulls Back On Phasing Out Diesel-Powered Big Rigs and Trains

The California Air Resources Board said Tuesday it withdrew its requests for federal approval to implement stricter emissions rules for locomotives and semi-trucks because the U.S. Environmental Protection Agency had yet to approve them, just days before Democratic President Joe Biden leaves office.

timesofsandiego.com