Coupling heights are critical in OO9 perhaps more than any other scale, certainly if you use the very fine (in both senses of the word) brass Greenwich couplings which we do.
A slight imperfection in the track can also cause stock to derail which sometimes happens to trains as they descend the hill into the station where there is a little dip on one side on the Cwm Cloch road bridge.
The remedy is not particularly difficult, it's just taken him more years than I care to remember to get around to fixing it.
So the three pictures here show how he first dug out the ballast..
...put some bits of packing under the sleepers on one side...
...and then re-ballasted.
You may be wondering how there came to be this dip in the trackbed, especially if you're used to building your layouts on a solid, flat piece of baseboard.
Bron Hebog was built with what is known as the open baseboard approach where a narrow, plywood trackbed is raised up on stilts all the way around, even in places where the trains are running in a cutting.
This makes it easier to model embankments or underbridges and you can see the same section of the layout under construction here.
The place where there was the problem is where it's a narrow, single track formation, going uphill on a slight curve and it seems that at some point there was a very slight twist got into it.
Hopefully that will be sorted now and he can take a look at the issue in the tunnel I mentioned previously, and a rather odd electrical gremlin in the fiddle yards which cropped up the last time we had the layout out on show.
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