Trog Posted October 22, 2012 Share Posted October 22, 2012 Cross section of CCX Pan9 check baseplate. Link to post Share on other sites More sharing options...
R A Watson Posted October 23, 2012 Share Posted October 23, 2012 Trog, If you check carefully the drawing which Keith put up is for 109lb rail with elastic spikes yours is presumably 113 with Pandrol clips, even more variety! What's the world coming to - rivet counting on check chairs - it's this sort of thing which builds modellers reputations in the wider world Wally Link to post Share on other sites More sharing options...
Trog Posted October 23, 2012 Share Posted October 23, 2012 There is a bit more to it than that, the drawing Keith has put up shows a family of guard rail baseplates. Guard rails are intended to keep derailed wagons etc running in a straight line, particually over larger bridges with weak or no parapets. Where otherwise they might veer off to the side and take a dive off the side of the bridge. Check rails are about the guidance of wheels on tight curves, and generally come with a range of flange way gaps depending on the radii of the curve they are intended to be used on. The elastic spikes would have been inserted through the pairs of squarish holes shown on the drawings on the guard rail side of the running rail. They appear to be optional perhaps to give a higher resistance to rail creep, hence the use of the word may on the drawing. The rail otherwise being held in place by the baseplate jaw. The oblong hole on the centre line of the baseplate on the no guard rail side would probably have taken something like an inverted T bolt with an ST or KT type clip tensioned by a nut. The CCX chair would as you say take 110A or 113A rail, and use one of the older Pan401 / Pan401A type clips, to hold the rail down and into the jaw on the other side of the baseplate. Link to post Share on other sites More sharing options...
Edwin_m Posted October 24, 2012 Share Posted October 24, 2012 There is a bit more to it than that, the drawing Keith has put up shows a family of guard rail baseplates. That's rather confusing, since what the OP posted is clearly acting as a check rail not a guard rail and two of the three shown on Keith's drawing appear largely consistent with this but all are captioned as guard rail baseplates. The third uses a bullhead rail mounted horizontally outside the running rail, so it can only be a guard rail. Are you saying that there are others in the family that allow a greater separation between the rails, so as to act as a guard rail, or is it just a case of sloppy terminology like the confusion between trap point and catch point? Link to post Share on other sites More sharing options...
trisonic Posted October 24, 2012 Share Posted October 24, 2012 Not necessarily "sloppy", Check Rails equal Guard Rails in the 'States....which means there are more Guard Rails than Check Rails! Best, Pete. Link to post Share on other sites More sharing options...
Grovenor Posted October 24, 2012 Share Posted October 24, 2012 Guard rails are intended to keep derailed wagons etc running in a straight line, particually over larger bridges with weak or no parapets. Sometimes, yes, but this particular design is intended to prevent the derailment, if you look they have a flangeway of 2.5". Enough to avoid contact normally but will prevent a 5" wide wheel from falling into the gap, when a flange back contacts the guard rail the opposite wheel will have its flange up on top of the railhead and the resultant larger diameter should steer it back into line pretty quickly. Regards Keith Link to post Share on other sites More sharing options...
LNERGE Posted November 4, 2012 Share Posted November 4, 2012 Could be the same sort. It took a while to find but here's a better view of the check rail at Hitchin.. Link to post Share on other sites More sharing options...
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