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Before rebuild they were pretty much confined to coal drag service so they were restricted to lower speeds (under 40 MPH), not much due to their design limitations, as much as the type of service. After rebuilding, they were good for 65 MPH. They certainly were not "kidney busters". They were favorites with the crews (also with shopmen and dispatchers). "They rode like Cadillacs". They were easy to fire and were good steamers. With their feedwater heaters, they were economical with coal and water. "They left town with anything you hooked to their drawbar". I have personally seen them walk right out of Zeigler yard with 135 loads (10,000 tons), up the 1% grade to Zeigler Junction without so much as a slipped driver, not once but night after night. Their only real drawback
was their size. They were restricted from many sidings, bridges, branchlines and spurs. They were my all time favorite Q engine. They did it all, fast freights, stock trains, reefer blocks, mail and express extras AND coal drags! From: kpp80202 <kpp80202@hotmail.com> To: CBQ@yahoogroups.com Sent: Monday, December 19, 2011 3:03 PM Subject: [CBQ] Speeds of M4 and M4a Colorados? I was reading up on the Colorado type locomotives, and read that the cylinder bore was changed and other modifications done to allow them to run at higher speeds. Does anyone here know at what speeds the original and the rebuilt engines were cleared to run? Were these "kidney pounders" like many of the other 10-coupled locomotives?
Kevin Perez __._,_.___
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