Richard,
I’ve just re-read your thread as my planned extension has proven ridiculously expensive and we just cannot justify the cost, you could buy a house for the quoted price of a garage & railway room. A combination of complicated foundations, builders being in demand, low mortgage rates, and many staff returned to Europe post Brexit I guess, bad timing on my part. Anyway, the project has reverted to an overgrown garden room, and some outdoor track.
It’ll be 7mm to 0MF standards with curves of around 2.5m minimum radius, and will be an out-and-back to terminus & FY. In simple terms, a 7mm model will be about 34% of the volume of a 10mm scale model, and I guess the weight will be more or less in that ratio too. It will not be scenic as it’ll be around 1.1m above the grass (which is too small to be called a field, and not groomed enough to be called a lawn), but it will give me somewhere where I can run decent sized trains.
I guess my key question is, if you were doing it all again, would you go down the same route, using driven scaffold poles and scaffold jacks, and cable tray with Hardiebacker, or do you think there’s a better way? Having spent quite a bit of time in recent years helping maintain & repair my late pal’s garden line, I am anxious not to rely on wooden posts and trackbed. I note that you found the cable tray a bit flexible cross-ways, and I gather that the angle iron stiffeners and spacers were necessary to beef up the whole structure. Was the 1.2m spacing sufficiently close, you went down to 1.1 in places I think?
Our garden is around 200m (horizontally) and 65m (vertically) from the English Channel, so there will be no lack of salt air, and whatever I do will need to be well protected from corrosion.
I wonder if doing away with the cable tray, and having a pair of galvanised angle iron beams between the jacks, with the Hardiebacker bolted directly to them might not be a simpler (and potentially cheaper) approach. Any thoughts and recommendations you may have ( indeed, any other garden rail builders/operators may have) would be very welcome.
Thanks,
Simon