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Bristol Barrow Road - Fiddle Yard Track Plan

barrowroad

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After a great deal of thought I've finally decided on a track plan for the fiddle yard - well the main bits anyway. There will be five storage sidings to the side of each of the up and down main running lines which will run through the middle of the sidings. The sixth track will be a run around loop for locos etc. This also has a pair of turnouts for additional storage into the four corners in order to maximize use of the space available. I am considering putting one or more loco turntables in the corners next to the wall.
Having finally "mastered" Templot - well sufficient to produce the plans in the attached photos - the entrance/exit at each end is via a pair of C12 scissor crossovers. These are on a 1600mm curve and are at 50mm centres. I went for the C12 as the minimum radius on the inner crossover is 44.4". The use of the scissors will give maximum flexibility.

 

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Gluing the printed A4 sheets together was an interesting exercise!

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Hi Robin.

Mmmm... Curved scissor cross-overs, eh? Sounds quite ambitious and a bit of a challenge to loco front bogies and trucks, not to mention filing the switch blades and the number of tie bars needed!

Hope it all pans out OK.

Dave.

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I'll look forward to seeing some phots of the down Newcastle bound TPO mixed running through there.

 

P

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Hi Robin.

Mmmm... Curved scissor cross-overs, eh? Sounds quite ambitious and a bit of a challenge to loco front bogies and trucks, not to mention filing the switch blades and the number of tie bars needed!

Hope it all pans out OK.

Dave.

 Hi Dave, 

The alternative is four crossovers. Two would be in the same position as the scissors but the other two would be on the curved end boards which have a 1400mm radius in places. This is fine for the curved main line but would produce a tighter radius than the scissors.

Hope to see you on Sunday.

Robin

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I expect the trackwork to be ready for inspection at the weekend old chap, what.

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That looks fabo!! I could do with some track building pointers...

 

Have a great S4N, I shall be decorating my sons new house in Hemel

 

Mike

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Switched diamonds?

It is a diamond crossing with turnouts so yes you could also call it that. 

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That looks fabo!! I could do with some track building pointers...

 

Have a great S4N, I shall be decorating my sons new house in Hemel

 

Mike

 Hi Mike, Glad you like it. Hope to see you at the meeting next tuesday. Happy to advise/assist with your trackwork. I'm off to do some decorating at my son's tomorrow though I expect you'll have to do more than me:-)

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Hi Robin,

 

Looks good. With 1:12 turnouts the K-crossings will be around 1:6, so should be fine for fixed K-crossings at that radius. To be absolutely sure on a curve you may want to change them to movable K-crossings (switch-diamond), at the expense of extra point motors.

 

It's difficult to be clear from the photos, but I think you have some check rails missing. The K-crossing check rails need to be extended outwards in order to check the inner V-crossings. Or if you use movable K-crossings, check rails added.

 

regards,

 

Martin.

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Hi Robin,

 

Looks good. With 1:12 turnouts the K-crossings will be around 1:6, so should be fine for fixed K-crossings at that radius. To be absolutely sure on a curve you may want to change them to movable K-crossings (switch-diamond), at the expense of extra point motors.

 

It's difficult to be clear from the photos, but I think you have some check rails missing. The K-crossing check rails need to be extended outwards in order to check the inner V-crossings. Or if you use movable K-crossings, check rails added.

 

regards,

 

Martin.

Thanks for the advice Martin, I've not seen a switched diamond and would be unsure how to produce it in templot. Any pointers welcome? I assume the K-crossing check rails should be extended to the V-crossing wing rails?

Regards,

Robin - [a templot novice]

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Hi Robin,

 

A switch-diamond uses opposing pairs of moving blades at the centre, instead of fixed gaps and check rails. Here is a picture from RMweb of such a diamond-crossing:

 

http://www.rmweb.co.uk/community/index.php?/gallery/image/22907-dbs-60013/#top

 

gallery_6254_1177_1610490.jpg

 

They are much easier to build than ordinary diamond-crossings, and much more reliable in use. BUT they require two extra point motors. In effect they are two very stubby turnouts toe-to-toe. They must be arranged so that both sets of blades move over together, in opposite directions.

 

In Templot, click real > K-crossing options > movable K-crossings (switch-diamond) menu item.

 

More diagrams and notes about all this here: http://85a.co.uk/forum/view_topic.php?id=2144&forum_id=22#p14263

 

regards,

 

Martin.

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