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Post by afarlie on Aug 2, 2010 20:14:23 GMT
Hi,
I was wondering if anyone on here was able to help provide a set of metric figures and formulae for various 'standard' dimensions in respect of turnouts and switches used on the tube network...
I was wanting to try and model some points in an accurate fashion,
but was currently lacking the dimensional information to do this.
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mrfs42
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Big Hair Day
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Post by mrfs42 on Aug 2, 2010 22:47:17 GMT
I've probably got most of it in the PWI handbook - but it isn't easy to copy, as it runs to pages and pages and pages.
Probably the best (and easiest) solution would be to get yourself off to the local reference library and look at a copy of the Permanent Way Institution's handbook/textbook. The information is out there, but you're asking for an awful lot of stuff.
I'd offer to give you sight of my copy, but it is 300 miles away, as it the BS specification for bullhead points......
PS.
When you're designing points - do not, I repeat do not forget to include the heel block clearance in your calculations.
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Post by afarlie on Aug 2, 2010 23:29:38 GMT
I've probably got most of it in the PWI handbook - but it isn't easy to copy, as it runs to pages and pages and pages.
PS.
When you're designing points - do not, I repeat do not forget to include the heel block clearance in your calculations.Which is exactly? It's not something I'd come across in the ex GWR notes I'd found. Looks like I'll have to find a copy of the book you mention  |
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mrfs42
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Post by mrfs42 on Aug 2, 2010 23:34:54 GMT
It should be - it is the hinge point of where the blades attach to the straight stock rail. It's certainly mentioned in the GWR <spit> track course I've got, and the pivot point (badoom tish) of all turnout based calculations, unless there is a whizz bang new formula that has come out recently.
I think the notes are from Aldermaston in 1943. Very, very odd.
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Post by afarlie on Aug 2, 2010 23:53:36 GMT
It should be - it is the hinge point of where the blades attach to the straight stock rail. It's certainly mentioned in the GWR <spit> track course I've got, and the pivot point (badoom tish) of all turnout based calculations, unless there is a whizz bang new formula that has come out recently. I think the notes are from Aldermaston in 1943. Very, very odd. OK The notes I am reffering to are these one : www.norgrove.me.uk/permanent_way_notes.htmDo you mean what's noted simply as the 'heel' in those? (Or am I getting confused?) I'll have to draw a diagram it seems... |
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mrfs42
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Post by mrfs42 on Aug 3, 2010 9:11:54 GMT
Yes - the heel is mounted on heel blocks.
The same dimension also crops up with check lumps.
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mrfs42
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Post by mrfs42 on Aug 11, 2010 19:31:50 GMT
Right - if you can find it, I'd recommend that you get your hands on a copy of the book British Railway Track: Design Construction and Maintenance - if you can, try and get a copy of the Third Edition (1964); the relevant chapter is 60 pages long with several large charts and lots of formulæ (32 and lots of rearrangement). Having quickly read the relevant chapter, it is a lot more intuitive than the current (?1990s) version. OK - it's not metric, but then again neither is the root gauge of the rails!  |
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neilw
now that's what I call a garden railway
Posts: 284
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Post by neilw on Aug 12, 2010 9:20:58 GMT
have you thought about joining the Scalefour society? All the info you need is there www.scalefour.org |
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Deleted
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Post by Deleted on Oct 11, 2010 19:31:26 GMT
If you designing with Flatbottom then Network Rails Handbook 49 is a great help.
The same principles can be used for Bullhead but beware that the origin of the switch is not tangential to the "through route" and is offset slightly.
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