If you go down to the woods today

 Isaac and his brother co-created today's layout. It started with a fairly basic loop around the seven arched viaduct (this is definitely the most popular track piece at the moment). I thought we were going to get another simple layout and then at the last piece Isaac put in the points.

Even at this stage I thought it would just be a siding and I suppose looking at it in it's purest form that's just what it is. But, oh what a siding.

The loop back followed by the hump back bridge was the clue something bigger was planned. The next set of points allow it split into two branches. One for the engine shed and one for the repair shed. Interestingly to reach the engine shed you have to cross the points and then double back. Given that there is a lot of Y points available I'm not sure why this configuration was chosen. The turntable was added to give access to rolling-stock stock sidings.

I have to say I zoned out a little on what was going on at this point. I came back into a heated debate about the height of a 'cave'. Isaac was building a small tower near the viaduct. His brother was of the opinion that it shouldn't be that high. Eventually gravity won due to a carpet not being the best foundation for a tower. This borne out by the fact that not one major skyscraper in the last 75 years has been built on a foundation of either loop or shag pile. So Isaac's brother won the argument and the cave was dully built as low rise and occupied by a black bear. I have a feeling the wooden shape was supposed to be a sheep, but it is rather bear like.

Finally with some left over pieces Isaac and his brother constructed a small loop and siding that were completely detached form the rest of the layout. It's the thing that looks like a speech bubble. This is mummy and daddy's track. Presumably to keep us out of harms way in case we want to play trains too.