MichiganRailroads.com - Lower Peninsula Railroads
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Re: 4 axle and 6 axle
Count the wheels on each truck...2 wheels on each side of each truck is considered 4 axle, and 3 wheels on each side of each truck is considered 6 axle. Keep in mind, some of the newest loco's (currently being manufactured) from both builders can have 6 axles, but only 4 powered. This comes with the latest technology in tractive effort and horsepower.