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| Re: CSX crossing in Darby, PA (512301) | |||
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Re: CSX crossing in Darby, PA |
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Posted by TransitChuckG on Mon Nov 5 09:30:33 2007, in response to Re: CSX crossing in Darby, PA, posted by TransitChuckG on Mon Nov 5 09:26:37 2007. More from Philly Traction. Possible near future problems.> > > Griffin, thanks for the update. I wonder if that scratch thing is > going to be a problem. > > Chuck Greene > > > Chuck and Griffin,this is not good.You have to think in three dimensions to understand.The flat portion of the trolley wheel is supposed to ride the flat portion of the rail and the flange is designed to guide and keep it there in the grove.At the crossing the space in the trolley rail is designed to allow the CSX wheel to clear.What is happening is the space is allowing the trolley wheel to drop onto its flange and onto the CSX rail forcing the flange to carry the entire weight of the car.This is the scratch you are seeing.The flange is not designed for this load.Eventually this stress is going to chip the trolley wheel flange.This will cause problems especially at the switches.Possibly a chipped flange will allow the car to go the wrong way and derail.The only solution I see is to "grove" the thru rail of the CSX.Looks like someone got a bad set of spec's for the diameter of the "K" wheels and flange depth.Maybe it's that NASA problem of converting metrics to inches.A close up of the K going thru the crossing will probably tell the story.I'm sure what was designed there was for the flat surface of the trolley wheel to lie on both sides of the space and keep the flang high enough off the CSX rail.It's only going to get worse over time as the trolleys wear away at the rise.Any solution seems to cause problems from the transportation board. Jack |
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