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DT
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4,794 Posts
And they didn't use GPS - doesn't work under rock.

I assume they did a bunch of calculations and monitor the position of the cutting heads relative to the path they had cut.

It does curve quite a bit.



On my layout, I mark the track position first with a pencil on the baseboard. I then lay some cork roadbed, then I redraw the lines. I use a metre rule, keeping the centre of the track aligned with the line. If I need a parallel track, I use a Peco track-gauge which works quite well.
 
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