RMweb Premium Compound2632 Posted February 15, 2020 RMweb Premium Share Posted February 15, 2020 I am struggling, with the aid of diagrams, to understand how a double slip with all four pairs of switch blades operated by a single lever can provide all four possible routes. Link to post Share on other sites More sharing options...
RMweb Gold TheSignalEngineer Posted February 16, 2020 RMweb Gold Share Posted February 16, 2020 Possibly, I remember it being near to the footbridge where that was taken. Link to post Share on other sites More sharing options...
Grovenor Posted February 16, 2020 Share Posted February 16, 2020 11 hours ago, Compound2632 said: I am struggling, with the aid of diagrams, to understand how a double slip with all four pairs of switch blades operated by a single lever can provide all four possible routes. It changes from a diamond crossing where either crossing route can be used to a bit of interlaced track where either slip road can be used. The pairs of blades at each end work in opposition not together as in the usual arrangement. Rgds 1 Link to post Share on other sites More sharing options...
Keithnewton Posted February 16, 2020 Share Posted February 16, 2020 (edited) Came across this topic after searching for information regarding point rodding and cranks for double slips. My example is where each end of the DS is controlled by a lever in the signal box. - I have assumed that each stretcherbar is connected to an adjusting crank and these would move together (one end of DS) - however the two cranks operating rods would have to connect together somewhere in order to connect to the next crank and eventually to the signal box lever, see diagram Does anyone have any drawings or photos how this was done please? Edited February 16, 2020 by Keithnewton spelling mistake Link to post Share on other sites More sharing options...
RMweb Gold TheSignalEngineer Posted February 16, 2020 RMweb Gold Share Posted February 16, 2020 Close to the adjusting cranks one of these is used underneath the channel rodding to split off the second drive. https://portal.unipartrail.com/Catalogue/ViewProduct.aspx?sku=1815&Dept_ID=1170&CatNumber=0086/063201 Link to post Share on other sites More sharing options...
Keithnewton Posted February 16, 2020 Share Posted February 16, 2020 Thank you for your reply I guess the "channel" is for the main rod to go though and the second rod is connected to the lug? Do you know how this is mounted, ie is the "lug" at the top, bottom or side? as below: Link to post Share on other sites More sharing options...
RMweb Premium Compound2632 Posted February 16, 2020 RMweb Premium Share Posted February 16, 2020 3 hours ago, Grovenor said: It changes from a diamond crossing where either crossing route can be used to a bit of interlaced track where either slip road can be used. The pairs of blades at each end work in opposition not together as in the usual arrangement. Rgds Thanks, that makes sense now. A multiplicity of cranks there - must have needed some heft to get the lever over - and not something that can be replicated using any of the Peco double slips! Link to post Share on other sites More sharing options...
RMweb Gold The Stationmaster Posted February 17, 2020 RMweb Gold Share Posted February 17, 2020 22 hours ago, Keithnewton said: Thank you for your reply I guess the "channel" is for the main rod to go though and the second rod is connected to the lug? Do you know how this is mounted, ie is the "lug" at the top, bottom or side? as below: As it is channel rodding the lug will be at the bottom because the channel is the under part of the rod in order to lie on the rollers. As can be seen more or less dead centre in this view (click on the image to enlarge) - 1 2 Link to post Share on other sites More sharing options...
Gordon A Posted February 17, 2020 Share Posted February 17, 2020 Something in the back of my mind thinks that double slips in the main running line on the Western had a speed limit imposed on the trains passing over them ie 15mph? Gordon A Link to post Share on other sites More sharing options...
RMweb Gold The Stationmaster Posted February 17, 2020 RMweb Gold Share Posted February 17, 2020 3 hours ago, Gordon A said: Something in the back of my mind thinks that double slips in the main running line on the Western had a speed limit imposed on the trains passing over them ie 15mph? Gordon A I doubt it as there was one in the Up Main at Patney & Chirton and I can't really see the Up 'Limited' dropping down to 15 mph to run through on the 'straight' road. But almost certainly 15 mph (or less) through the divergences. 1 1 Link to post Share on other sites More sharing options...
MidlandRed Posted February 17, 2020 Share Posted February 17, 2020 On 13/02/2020 at 02:26, Swindon 123 said: Allscott signal box between Shrewsbury and Wellington (Salop) has a double slip, and on a 70MPH main line as well. It was operated by rodding. See picture below on my Flickr site of said location after the box had shut. Paul J. Clearly not here either - 70 mph on the through roads. The slip looks a tight turn though (possibly foreshortened in the photo). 1 Link to post Share on other sites More sharing options...
Keithnewton Posted February 18, 2020 Share Posted February 18, 2020 On 17/02/2020 at 12:11, The Stationmaster said: As it is channel rodding the lug will be at the bottom because the channel is the under part of the rod in order to lie on the rollers. As can be seen more or less dead centre in this view (click on the image to enlarge) - Thanks Mike Good picture and example of how it works for channel rodding. Is it the same / similar for pre grouping round rodding? Link to post Share on other sites More sharing options...
RMweb Gold TheSignalEngineer Posted February 18, 2020 RMweb Gold Share Posted February 18, 2020 On 17/02/2020 at 13:04, Gordon A said: Something in the back of my mind thinks that double slips in the main running line on the Western had a speed limit imposed on the trains passing over them ie 15mph? Gordon A The turnout side was, as with crosovers, limited to 10mph unless otherwise stated according to the WTT. 1 1 Link to post Share on other sites More sharing options...
RMweb Gold The Stationmaster Posted February 19, 2020 RMweb Gold Share Posted February 19, 2020 21 hours ago, Keithnewton said: Thanks Mike Good picture and example of how it works for channel rodding. Is it the same / similar for pre grouping round rodding? Definitely was normally the case on the Western (Great and Region) and no doubt the same elsewhere because the drive from the lug would be going to a crank. set below the level of the rodding run. You might possibly find examples of something different used in specialised circumstances but I've never seen, or photographed, any (which obviously doesn't mean they didn't exist!). Link to post Share on other sites More sharing options...
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