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26 Mar 2019 23:25


Dundee, United Kingdom

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There has been a Topic on the JMRI site over the last few days concerning Marklin double slips. What was discussed was not really relevent but today Andy Reichert put on some links to impressive formations.

Well worth a look. An interesting bit of un-connected bit of track in the second one. Switched diamonds in many of the slips as well.



16 May 2019 06:00




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As is often the case there's a bit more to a picture of track than is referred. Your first link is to a major commuter system into and out of Chicago. (There are larger images of that location found on the net). Most of the fixed acute angled crossings seen in the image are what's called 'self guarded'. A raised flange as part of a single cast structure along with the crossing point guides a wheel from its face side (the field side of a wheel) and steers it through the crossing, eliminating the need for a check rail. Yet every one of those 'self guarded' crossings in the image DO have check rails, making for quite a piece of prophylactic engineering. As you might suspect it's relegated to slower speed operations. The self guarded types can be spotted by the flaring of the raised sides that appear before the point of the crossing as opposed to the flaring of wing rails that reside mostly beyond the point of a crossing. Some 'self guarded' fixed acute crossings have also been designed for flange bearing movements in which a wheel supports itself on its flange while transitioning the crossing. Over time a wearing of a groove due to flange supported movements lowers the wheel until it is supported on its tread. The whole idea is to extend the life of the crossing component. This type of crossing seems to be limited to the US and Canada, where apparently wheel tread width is set to a single standard.

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