The Environmental Protection Agency will publish a direct final rule October 9 allowing petroleum refiners to continue producing diesel fuel containing up to 500 ppm of sulfur for use in older locomotive and marine engines beyond 2014. The rule clarifies the timeline for locomotive and marine diesel and heating oil companies to transition away from a yellow marker added to some fuels to distinguish between different product categories and allows home heating oil producers to produce renewable fuel credits for fuel from biomass. The direct final rule will take effect December 10.