TRACK CONSTRUCTION
Total track length will be about 500 metres. I am using Cromar White 27mm high steel rail which has been galvanised. I ordered the rail in 2m lengths as I decided that 4m was too long to safely handle single handed. Also the extra joint gives ample expansion gaps bearing in mind the high temperatures that can be achieved during August. How do I know that? Well thanks to the internet, I found a little firm in Farnborough that specialises the thermometers, of every kind. They had one that is magnetic and measures the surface temperature. Fantastic and very affordable too!
After much deliberation and costing exercises I decided to use the PNP plastic narrow gauge sleeper over a BPI recycled polythene one. Partly due to a 25% increase in the price of the latter, but also because the PNP ones are completely preformed, requiring no drilling or cutting. After several years in the sun I am happy that the sample supplied, although now lighter in colour, still retains its original strength. After hitting with a sledge hammer I found no damage!
A set of rollers and a ‘Jim Crow’ was custom made by Roger Greatrex and I am really pleased with these as they make track & turnout construction a joy.
POINT CONSTRUCTION
After constructing several 9m radius, track panels I built my first turnout. Cromar White supplied 4 sets of pre-fabricated steel templates for both the blade section and the crossing section complete with crossing. They also supplied the point blades and stock rails machined accordingly, so apart from minor fitment, rail curving and assembly, quite straightforward assembly really!
I did not need to draw out a template on the bench as the Cromar White supplied base components were fabricated to my desired radius of 30ft. This made the positioning of rails easy.
As you can see, I am using BPI 50mm sq recycled polythene for the point construction as PNP do not supply anything suitable. The BPI section comes in nominal 3m lengths and is easy to cut with a hand wood saw.
With a bit of filing for fitment, the rails fit snugly into sockets on the crossing template.
If you are interested in track & point design construction, you must look out for a second hand copy of 'British Railway Track' published by The Permanent Way Institution. My copy is dated 1971 and was £3.50 when new!
I am so pleased with these components I intend to order another four sets from Cromar White.
During the Summer of 2007, straight and curved templates were fabricated to facilite track assembly. The photo above shows a straight panel that has just be assembled. Thanks to Peter Ladbrooke for the mathematical calculations and assistance with construction.
The cutting of curved rail is crucial if the fishplates are to remain opposite each other. Some people prefer staggered joints. I don't. We now have tables giving the shortening dimension required for the inner rail for 6 and 9 metre radius curves. These tables are only correct for Cromar White 27mm high steel rail at a gauge of 187.18mm. I am once again indepted to Peter Ladbrooke who provided me with the formula in order to calculate these tables. The tables also take into account the expansion & compression occuring to the outer and inner parts of the rail that occurs when rolling. If you would like a copy of these, please contact me at the address shown on the front page.
During May 2008 a second point was constructed. This one is a great improvement over my first one. I spent more time on the fit of the point blades and stock rail, taking off small amounts using a fine abrasive disc on the angle grinder. I also located a supplier of square stainless steel washers when I was in the UK last year. These are preferable to using round washers. Once again I used the recyled polythene for the timbers.
