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probably need a box below the baseboard to encase each LED feeding the respective fibre optic cable to ensure there was no light bleed, but could be an interesting possibility.  I've never worked with fi

heatshrink,push led  one end into a  bit heat shrink  and the fiber into the other.

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so not sure how the light goes on around tight curves?

looking at a few data sheets  20-1 ratio seems to be the recommended.so 0.25 o/d has a minimum bend radius of 5mm, 0.5mm 10mm etc

Oooh hadn't thought about heatshrink, thats a good idea.  Might have to get some 0.25/0.5 fo and have a play, a 5mm radius bend could be a bit big for N gauge.  Still room to try and see what I can come up with.

Richard

@Newportnobby  ... whereas I would always recommend DON'T cover the entire baseboard, it's a total waste of cork!!   Certainly you'll need to use a few rectangles of cork under lineside buildings that need to be set at the same base height as the track, but you don't need it under the general town buildings, roads, scenery etc.  Use it only where needed.

You don't need to use a single wide strip for double track, use 1" wide strips under each track.



For curves use 2x 0.5" strips either side of the centre line, as that's easier to bend round the curve.




The last batch of cork sheet I bought was from an ebay seller with a name something like "The Fridge Magnet Shop".  2mm thick if I remember correctly.

With the thin strips you get nicely raised track and a ballast shoulder, if that's the effect you're looking for?

@Shropshire Lad Nice shot, thanks for that. I can imagine from a drivers perspective its a far easier layout to navigate.  You don't happen to have any similar views of the old layout at all do you?

Re the 20s.  Yes, I did know they were regular around there, I am assuming they must have moved a set into the works prior to light engine move I photographed, but I did not realise there was any move yesterday!  Lovely to hear them depart tho. 

Cheers
Richard

And a somewhat earlier double-decker from Minichamps:

As you said the new layout at Derby has been really simplified.

This was taken on the approach from Pear Tree.



Pairs of pairs (eh?) of class 20s fairly regularly move Tube stock and Elizabeth line stock from Derby to Asfordby for testing.