Garden rail plan
Scaffold 24" ground supports
This part involved a 6" ground/soil auger to help drill the many holes to anchor the scaffold poles in the ground with a 1x20Kg bag of Post-Crete for each post that was in a 600mm/24" deep hole. Fortunately my arms are about 24" long as well as the auger wont drill out the larger stones & these needed to be removed by hand. The only fitting i needed was fixed double coupler to form the crucifix shape needed. I found it easier to fit oversize poles with a 50mm waste pipe sleeve before cementing in & then use a laser level to mark the cut off point on each pole & then pull it out the ground sleeve & cut with the metal chop saw & then refitted the pole. at this point its worth going around & numbering each pole before removing with a black sharpie if removing more than one at a time. The scaffold can be picked up online with many selling off after a building project I got nearly 500 feet with lots of fittings & boards for £600:00. New is around £2:00 per foot plus fittings at £2.25 each. So easily well under 1/2 price & perfectly usable.
Plan of garden railway track
Decking / Track bed
The reason to use composite decking was a lot less maintenance with the UK weather & easy to fix to. I chose a neutral black/dark grey board to blend in with most things, but brown woodgrain is also available.
I wanted to use the 4-5met X 150mm lengths at around £7:50 per metre, but couldn't find any good deals on the longer lengths & went with the 3met X 140mm size at £4:00 per meter including fixings that i didn't need. I plan to use it length ways down the straights & 330mm cross ways around the corners in a fan shape. But have decided to create corner bends cut at angles that would create a 16 sided circle known as a "hex decagon". For each 90 degree corner i will need four segments of the 16. Now i could of gone for 8 or 12 sided, but the 16 sided suited the track i had "LGB R3" at around 485mm long. The equations for this will take ages to explain, so this link at The Engineering Tool Box is very helpful as long as you just know the Radius of your circle. So if you wanted a complete R1 train track circle to fit on an 8 segment circle you would enter 600 radius & 8 in the segments & it will give you all the answers you need. On this calculation it will give you an angle to cut of 45deg, This has to be split in 2, so the cut on B & C will be 22.5deg on each side with a total of 45deg.
Most of this decking will be fixed underneath with 50mm stainless steel saddles/clips.
One thing not to do with the decking is use strips of hard wood in the central slots. When the wood gets wet/damp it swells up & splits the deking "As per picture on right. "Glad i found out
on my 1st try" So i will try another good cheap method & use some cheap
plastic/nylon chopping boards to bridge the gap. These shouldn't swell up.
To covers all ground beneath the track, 11 ton of granite chippings was needed at around £60 a ton inc vat. Now i thought this was ok considering my 14mm golden drive stones where £57 per ton & the granite chippings are a lot better looking & it adds some realism.
Garden railway plan
Points on the revers loops i have just added a spring's to force the manual change over. All other points i have done via Wi-Fi & relays with servos controlled via ewelink at a cost of less than £10 a year. This can also be used for hundreds of other home automation items. Not that its needed, but can operate from another country in the world if needed. But i found my local tablet is fine or even Alexa works really well, but my neighbours think i am mad barking orders at my trains. :) I have also added a red/green signal to indicate which way the points are facing so i can see from 30 met away. This is a simple red for siding/turn out, & green for the main line indicating which way the points are facing. .
Plan of garden railway track
Garden railway layout
50mm stainless steel saddle.
140X3000X25mm composite decking board