https://www.msn.com/en-us/autos/news/8-diesel-locomotive-breakthroughs/ar-BB1kDRbn?cvid=72385282bbcc40efa346eec0e9ba1202&ei=2 https://www.msn.com/en-us/autos/news/8-diesel-locomotive-breakthroughs/ar-BB1kDRbn?cvid=72385282bbcc40efa346eec0e9ba1202&ei=2 https://advanced-steam.org/ufaqs/tractive-effort/