RMweb Gold Popular Post Re6/6 Posted February 3, 2015 RMweb Gold Popular Post Share Posted February 3, 2015 (edited) Following on from Andy R's suggestion, do post anything that is either an interesting or unusual formation both at home and abroad. Also anything interesting that someone has modelled. For starters this double scissors at Utrecht (apologies that I've posted this before). Abt rack at Brig in Switzerland Early on in US railroads. Presumably to stop companies from using each other's tracks maybe? Something from me that I built years ago for a never completed dock layout. Edited February 3, 2015 by Re6/6 24 Link to post Share on other sites More sharing options...
Vanders Posted February 4, 2015 Share Posted February 4, 2015 Trams are always good for unusual pointwork. I was impressed with this arrangement in Ghent: http://goo.gl/jtW7d1 Maybe not that unusual individually, but it's a bit much when you consider that outside slip and double lead junction all are for a bit of tramline that no longer exists! 1 Link to post Share on other sites More sharing options...
edcayton Posted February 4, 2015 Share Posted February 4, 2015 Maybe a little OT, so with John's forbearance, could somebody please explain to me in idiot's terminology, the difference between inside and outside slips? TiA Ed Link to post Share on other sites More sharing options...
johnb Posted February 4, 2015 Share Posted February 4, 2015 I do like the fourth down in the photoset. Looks like it's a case of "Oh buffer! How do we get round THAT corner?" The answer by the track laying foreman was "Like this guv!!" 2 Link to post Share on other sites More sharing options...
jim.snowdon Posted February 4, 2015 Share Posted February 4, 2015 That sort of "over and back" curve is not unusual in tramway practice when trying to negotiate old street layouts. Jim Link to post Share on other sites More sharing options...
RMweb Premium Reorte Posted February 5, 2015 RMweb Premium Share Posted February 5, 2015 I do like the fourth down in the photoset. Looks like it's a case of "Oh buffer! How do we get round THAT corner?" The answer by the track laying foreman was "Like this guv!!" Oh yes, that's what's going on, it wasn't that there was a car parked there when they were laying the track Link to post Share on other sites More sharing options...
RMweb Premium kevinlms Posted February 5, 2015 RMweb Premium Share Posted February 5, 2015 The USA one. Clearly that dates back to the days of non-uniform gauge. There existed several non standard gauge (usually greater than standard gauge) in the early days, but relatively early to fix. Well before the demise of Brunel's mistake. http://en.wikipedia.org/wiki/List_of_track_gauges#Broad_gauge Link to post Share on other sites More sharing options...
RMweb Gold Re6/6 Posted February 5, 2015 Author RMweb Gold Share Posted February 5, 2015 Maybe a little OT, so with John's forbearance, could somebody please explain to me in idiot's terminology, the difference between inside and outside slips? TiA Ed A 'normal' slip (compound) point A semi-outside slip A 'full' outside slip (can't find a pic!) is where all the curved rails are totally outside the diamond crossing. 3 Link to post Share on other sites More sharing options...
buffalo Posted February 5, 2015 Share Posted February 5, 2015 (edited) ...A 'full' outside slip (can't find a pic!) is where all the curved rails are totally outside the diamond crossing. Surely, if all the curved rails are outside the diamond, you just have a scissors crossing? It makes no difference whether the outer routes are straight or curved, the form is the same. I must admit, though that I don't recall seeing a scissors in which the outer routes have opposite curvature. Nick Edited February 5, 2015 by buffalo Link to post Share on other sites More sharing options...
RMweb Premium kevinlms Posted February 5, 2015 RMweb Premium Share Posted February 5, 2015 Surely, if all the curved rails are outside the diamond, you just have a scissors crossing? It makes no difference whether the outer routes are straight or curved, the form is the same. I must admit, though that I don't recall seeing a scissors in which the outer routes have opposite curvature. Nick Not true. An outside double slip has a similar layout to a scissors crossover, the difference being that 2 parallel routes cannot be set up at the same time for trains to pass. I've never seen one, but Wikipedia shows one. http://en.wikipedia.org/wiki/Railroad_switch#Outside_slip Link to post Share on other sites More sharing options...
edcayton Posted February 5, 2015 Share Posted February 5, 2015 Help! Now I'm confused again. Ed Link to post Share on other sites More sharing options...
buffalo Posted February 5, 2015 Share Posted February 5, 2015 Not true. An outside double slip has a similar layout to a scissors crossover, the difference being that 2 parallel routes cannot be set up at the same time for trains to pass. I've never seen one, but Wikipedia shows one. http://en.wikipedia.org/wiki/Railroad_switch#Outside_slip What's not true? That photo at Heidelberg is just the extreme case of an outside slip as shown in John's second photo. The only difference is that the inside rails of the two outer routes are adjacent. It is not the case that john describes as "all the curved rails are totally outside the diamond". Yes, in any double slip the two outer routes cannot be used at once, but if "all the curved rails are totally outside the diamond", you have a scissors crossing and they can provided there is enough lateral clearance. Nick Link to post Share on other sites More sharing options...
RMweb Gold Re6/6 Posted February 5, 2015 Author RMweb Gold Share Posted February 5, 2015 Now I'm confused! Link to post Share on other sites More sharing options...
garethashenden Posted February 5, 2015 Share Posted February 5, 2015 Aren't slips (all slips) fundamentally diamonds where as scissors are fundamentallly parallel tracks? They both have extra rails and complication, but that seems to be the main difference. Link to post Share on other sites More sharing options...
buffalo Posted February 5, 2015 Share Posted February 5, 2015 (edited) No need for confusion, John, The photos in your post shows a normal or inside double slip and an outside double slip. Nothing 'semi' about it, it's a 'fully' outside slip. I believe the 'semi' term has been used to describe a double slip where one side in inside and the other outside, though I don't know of an example. As I understand it, the inside/ouside distinction describes whether the point blades are inside or outside the diamond. Nick Edited February 5, 2015 by buffalo Link to post Share on other sites More sharing options...
edcayton Posted February 5, 2015 Share Posted February 5, 2015 . As I understand it, the inside/ouside distinction describes whether the point blades are inside or outside the diamond. Nick That makes sense. I was thinking about the curved route being inside/outside the point. Thanks Nick Ed Link to post Share on other sites More sharing options...
RMweb Premium kevinlms Posted February 5, 2015 RMweb Premium Share Posted February 5, 2015 What's not true? That photo at Heidelberg is just the extreme case of an outside slip as shown in John's second photo. The only difference is that the inside rails of the two outer routes are adjacent. It is not the case that john describes as "all the curved rails are totally outside the diamond". Yes, in any double slip the two outer routes cannot be used at once, but if "all the curved rails are totally outside the diamond", you have a scissors crossing and they can provided there is enough lateral clearance. Nick What's not true? Is your earlier suggestion (Post 9) that an outside slip & a scissors crossover, is the same thing. A scissors crossover can have 2 trains pass, (on the straight(ish) tracks- I don't think the tracks have to be straight), that isn't possible on an outside slip (or any slip for that matter). I'm sure Martin Wynne, will be along soon to correct any misinformation, with examples of the differences. Link to post Share on other sites More sharing options...
buffalo Posted February 5, 2015 Share Posted February 5, 2015 What's not true? Is your earlier suggestion (Post 9) that an outside slip & a scissors crossover, is the same thing... Why not read what I said and stop putting words into my mouth? Surely, if all the curved rails are outside the diamond, you just have a scissors crossing? In other words, if all the curved rails are outside the diamond, you do not have a double slip. The "all the curved rails..." bit was from John's post where he said ...A 'full' outside slip (can't find a pic!) is where all the curved rails are totally outside the diamond crossing. Nick Link to post Share on other sites More sharing options...
Brian Harrap Posted February 5, 2015 Share Posted February 5, 2015 Not exactly a 'formation' but a little novelty to consider - speed humps for rail vehicles. Brian 11 Link to post Share on other sites More sharing options...
RMweb Gold Re6/6 Posted February 6, 2015 Author RMweb Gold Share Posted February 6, 2015 Not exactly a 'formation' but a little novelty to consider - speed humps for rail vehicles. Brian Where on earth was that Brian?! Link to post Share on other sites More sharing options...
Brian Harrap Posted February 6, 2015 Share Posted February 6, 2015 (edited) Where on earth was that Brian?! The old docksides Ipswich, John. I don't actually see the why or how of it or what real purpose it served. An apprentice piece perhaps. Brian. Just thought, it's probably a track scotch block type thing that cars can drive over. B Edited February 6, 2015 by Brian Harrap Link to post Share on other sites More sharing options...
RMweb Gold The Stationmaster Posted February 6, 2015 RMweb Gold Share Posted February 6, 2015 The old docksides Ipswich, John. I don't actually see the why or how of it or what real purpose it served. An apprentice piece perhaps. Brian. Just thought, it's probably a track scotch block type thing that cars can drive over. B It does look as if it might once have been movable judging by those adjacent gaps full of muck - maybe it rotated??? Link to post Share on other sites More sharing options...
talisman56 Posted February 6, 2015 Share Posted February 6, 2015 From the look of the two sections that are across the rails, there might be an associated operating lever that moves them into the gaps to their right in order to allow rail traffic to pass... Link to post Share on other sites More sharing options...
Brian Harrap Posted February 6, 2015 Share Posted February 6, 2015 (edited) This is only a single of course, but it must be a half inside, half outside slip. None of it straight either. Brian Edited February 6, 2015 by Brian Harrap 11 Link to post Share on other sites More sharing options...
Southernman46 Posted February 7, 2015 Share Posted February 7, 2015 Showing the West end of platforms 16 & 17 at Clapham Junction looking towards the Brighton Slow lines (a goooood long while ago)............................. ??? Banking / pilot engine release siding for trains coming up from the WLL ?? Link to post Share on other sites More sharing options...
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