Friday, February 23, 2018

Jump or Lift Frogs in Railroad Turnouts

We have already seen diamonds, OWLS, that allow a low-speed line to cross a high-speed line without putting any gaps in the high-speed line. The low-speed line has ramps that lift the flanges of the wheels up and over the high-speed rails. The following posting indicates the same flange-lifting technology can be used for the frog of turnouts to sidings and other low-speed lines.

Chad Winn posted two photos:
JC Walker BNSF has lots of them.
John Ray Only we call them high lift frogs.
Mark Gillings You don't feel anything going straight ahead. The diverging route is 10 mph and it is bumpy.
Rick LeggettGroup Admin Flange bearing technology has been in use for quite a while now. I remember over 15 years ago, TTCI in Pueblo testing to see if the flange on rail car wheels would support the weight of 286K loaded cars. Once it was determined that they could, designs for 'leap/jump frogs' and 'OWLS' (One-Way Low Speed) at-grade track crossings (diamonds) came out. I don't know of any railroads that allow a higher speed than 10mph, for the flange bearing route though. The whole purpose of course, is to eliminate the 'gaps' of frogs & diamonds on the higher speed/tonnage side of the application.
Dale Leipert CP has lots of them . Can't feel a thing on the main but you sure can through the turn out .gaurd rail is very important .



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