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NMRA HO wheel profile and how it relates to friction?
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[quote]QUOTE: <i>Originally posted by dinwitty</i> <br /><br />model equipment is much lighter than the prototype, but good rollability is still a plus. <br /> <br />why there were sometimes curve oilers on the prototype. <br /> <br />also by design gauge would be slightly wider on curves, especially for large wheelbase steamers.. <br />[/quote] <br /> <br />Our RP-25 wheels have a bevel on the surface and ride centered on the track, but considering that we only put feet on our cars instead of miles per year, how can we worry about tire wear. Look at how long it takes to wear the plating off the drivers on a brass engine. <br /> <br />Curve oilers were used where their was a sharp curve with a high drag (read heavy cars and lots of them) and the flanges rub against the inside of the rail. The bad thing about curve oilers was it cut down on the traction for the loco because it oiled the top of the rail. <br /> <br />Railroads have been know to "open" the gauge a little on the curves but not very much as the cars would fall into the center of the track. One of the problems for the Pennsy [the standard (?) of the world] with the T-1, was the long wheelbase and it couldn't go all over the line. It would look, to me, like as long as they'd been designing locos they would have known better, but I guess it was their halfhimers. <br /> <br />I haven't looked at my track through a magnifier but I doubt that the rail heads are square as that is another problem for the manufacturers, curved would be easier to maintain. <br /> <br />Bob
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