As predicted yesterday, a thin blade was all that was needed to unfix the track from the trackbed. A cutting disc was used to cut the trackbed halfway, and a simple bending was all that was needed to snap it off. I then checked my diagram against the track and existing trestles that I had made and realised that they are too wide. The central and outer beam would be too far apart for the rails to sit directly over them as you can see below:
This meant a redesign was needed, so I designed a 4 pole approach instead of the current 3 pole structure:
So the trestle is now 1cm narrower, but now has better support for the track:
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