Air Resources Board withdraws request for approval of rules to limit pollution from diesel trains and big rigsCalifornia’s efforts to limit pollution from diesel-powered trains and big rigs were stalled in anticipation of pushback from the incoming Trump administration.The California Air Resources Board said on Tuesday it withdrew its requests for federal approval to implement stricter emissions rules for locomotives and semi-trucks because the US Environmental Protection Agency had yet to approve them. The decision came just days before Joe Biden leaves office. Continue reading...