Those who have just read about the turntable build may have noted yet another mock-up of the section house next to the approach track. If you missed it, have another look:
This is section house #6 – and the one I’m going to build.
Pierre Oliver and I went back and forth on the section house several times by email and phone – trading sketches and photos, and drawing on Pierre’s knowledge of building practices. We originally thought the section house featured a dormer, as seen on some of the previous mock-ups:
But in the end, we determined it’s most likely the roof on an adjacent shed:
The problem was that in order to get a roofline that looked like the one on the prototype…
…the dormer roof had to be a different pitch than the main roof. As Pierre says, that’s incredibly difficult to do – it’s a lot of math. While such challenging rooflines might be built on significant structures – on a major passenger station, for example – it’s unlikely the bridge and building department would have specified such a complex roof for a section house. It would have slowed down construction, and increased labour costs, for no benefit.
Once we decided it was two structures, designing a suitable pair of structures was easy peasy:
(Thanks for all the help on this, Pierre!)