Templot Club Archive 2007-2020
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posted: 12 Jul 2012 20:26 from: dave turner
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Hi In my neverending quest to learn about trackwork and templot in particular I've been looking at tandem turnouts. I have searched the previously posted topics on this subject and at this stage still need help on the following points.
I deliberately haven't included an example of what I'm attempting to achieve because it is the general theory rather than a specific example I'm looking for.Possibly neither of the latter ideas are appropriate within Templot's context. If so what work rounds are possible? regards Dave
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posted: 12 Jul 2012 21:29 from: Martin Wynne
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dave turner wrote:What is the difference between 3way and tandem turnouts?Hi Dave, Any turnout having 3 exits is called a 3-way turnout. They divide into 2 types: 1. three-throw turnouts. In this case both switches are coincident. They are difficult to build and prototypically rare -- used only in sidings and yards, and not at all for many years: 2_280950_180000000.jpg  2. tandem turnouts. In this case the switches are staggered so that the second switch is placed beyond the heel of the first one. They further divide into two types -- more usually with the second switch in the main road of the first switch; or occasionally with the second switch in the turnout road of the first switch. Tandem turnouts can be double sided or single-sided, according to whether the central exit is the main road (double-sided), or one of the side exits is the main road (single-sided). And further curved positive or negative from that to give a wide variety of possible formations. Here the main road is the right-hand road (see the first switch deflection), making this a single-sided left-hand tandem despite appearances: beverley_tandem3.jpg  Thanks to Mick Nicholson, and more at: topic 626 regards, Martin. |
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posted: 12 Jul 2012 22:18 from: John Lewis
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I have found a picture of a three throw turnout on the GWR. It is in "GWR Goods Services, Goods Depots and their operation" Part 2B by Tony Atkins (Wild Swan) It is on page 299, the lower picture, which is of Bath Goods Depot in 1908. John |
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posted: 14 Jul 2012 18:14 from: dave turner
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Thank you for your replies they made the difference clear. True to form Templot already has a way to achieve what I was looking for. Once I got my head around internal and external geometrical radii I realised that that is probably the way to specify the turnouts that I was attempting to create. I'm currently looking the design of a 2 by 4 road fiddleyard for a generic "roundy roundy" where the turnouts take the minimum possible space thus allowing for the maximum storage within the area available. Doesn't everyone? Nevertheless whilst the proposed yard is off-camera and doesn't need to be prototypical (shock-horror to some) reliable running is vital; therefore easements rather than the set-track approach is the order of the day. More importantly I want the exercise. Should I ever be even partially satisfied I'll post a design for this forum to comment on. Best regards to all Dave |
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