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In the Real world (not talking model here), the 6 axle served many purposes, one previously mentioned by art, and they can start a longer/heavier train and get it up to speed faster because of more tractive effort, which is why most of them are mainline engines. In theory two 6 axle (12 total axles) could take the place of three 4 axle engines (again 12 total axles). 4 axles are often used in local/switcher service, but not always, I have plenty of pictures of them on mainline trains also. For example the Rock Island towards the end often put many 4 axle engines together to make sure the train had enough power to get to its destination (the maintaince was so poor usually 1 or 2 engines broke down on the way)
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