The Rise and Fall of EMD's V20: The "Upgrade" That Backfired скачать в хорошем качестве

The Rise and Fall of EMD's V20: The "Upgrade" That Backfired

EMD bet big on cylinder count. In 1965 the SD45 arrived with the 20-645 V20 and 3,600 horsepower, promising fewer locomotives per train and lower costs. Railroads bought the pitch, but the real world pushed back: crankcase stress, heat management, and DC traction that couldn’t turn headline power into consistent tractive effort on grades or wet rail. Two decades later the SD80MAC paired the 20-710 with AC traction, finally putting big horsepower to the rail. It solved adhesion physics, but not fleet economics. A tiny 20-cylinder subfleet meant unique parts, training, and fuel burn that rarely penciled out against 16-cylinder AC power that did almost the same work with better commonality. The result was clear by 2000. SD40-2s and later 16-cylinder AC platforms won on cost per ton-mile, uptime, and standardization. The 20-cylinder experiments were engineering feats that tackled the wrong problem for North American freight. This is how the SD45 and SD80MAC told the same story, decades apart: power sells, but usable adhesion, reliability, and parts bins win. --------- We do not fully own the material compiled in this video. It belongs to individuals or organizations that deserve respect and consideration. This video was created under the Fair Use Law Section 107 of the U.S. Copyright Act of 1976. "Fair use" is allowed for purposes such as criticism, comment, news reporting, teaching, and research. It is transformative in nature, uses no more of the original than necessary, and has no negative effect on the market for the original work. #vintageamericanmachines #vintageengines