"CN’s initiative with Progress Rail and REG builds upon the locomotive builder’s approval in August 2021 of higher biodiesel fuel blend..." (Vantuono, 2021)
References:
Vantuono, William C. (2021, Nov 4th). CN, Progress Rail, REG Advancing Renewable Fuels. Retrieved from Railway Age: https://www.railwayage.com/mechanical/locomotives/cn-progress-rail-reg-advancing-renewable-fuels/?RAchannel=mechanical