Re: What's this harp stand being used for?

Posted by Chris Walker on
URL: http://c-sng-discussion-forum.254.s1.nabble.com/What-s-this-harp-stand-being-used-for-tp2224p2240.html

The RGS Derail is fitted with 3-way Stub Headblocks with extra rails spiked down from the third position, the Harp cannot throw the siding rails over onto the extra rails.  Those extra rails are to guide the rollaway car straight along the ties without deviating which would in that location possibly cause more problems.  
Basically the idea is to stop the cars from fouling the Mainline.
In the case of the Silica derail, being at the end of a branchline, I guess the grades are light and there is really no need for any deflecting rails. The scaletrack at the Chamberlain has a deflecting rail.

The Derail with open rail in the Normal postion is always downgrade on the siding, there being no need in this case to place one on the upgrade end of a siding.

The Roper Blog shot picture is of a thrown over casting not operated by a sw-st.

And that target at Silica seems to me to be an oddity, not the usual.  The DSP&P type of the original fabricated Harp sw-st at Buffalo for example, was similar of this type, maybe a throwback?
Beaver Brook has been the only CC harp I've seen with that style, then that too went to the double diamond.
see http://c-sn3-discussion-forum.41377.n7.nabble.com/One-For-The-Buffalo-Hunters-td1605.html