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I suspect clearance issues and axle loading became more of a problem for many modern fast freight and passenger locos or the roads decided horsepower was more important than absolute weight on the drivers. A number of roads experimented with alloy steel boilers to increase strength and reduce weight. NYC Niagra's even had aluminum cabs and running boards. It also became common practice to move the air pumps to the pilot deck or to the front of the smokebox - even GN did this. Some SP locos had their feedwater heater pumps moved under the cab. <br /> <br />The earliest 4-4-0 and 4-6-0 road locos had a gap between the drivers because they have a 3 point suspension for a smoother ride. I've read that those simple GN and UP 2-8-8-0's were really rough on the crew at anything over 25mph.
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