Please could you elaborate

After yesterday's issues with non cooperation Isaac and his brother seem to have patched up their artistic differences. Isaac started by building a fairly compact layout with loops that interconnected through the turntable.

What was particularly intriguing was that he was experimenting with the Y points again. Instead of directly running them into the repair shed he used it to provide one route into the shed and the other branch to be  a continuation of one of his loops. To reach the other bay of the repair shed he created a separate line in.

The engine shed was used in a more conventional manner apart from the bridge that needed to be negotiated to get in.

This layout persisted for an hour or two until Isaac's brother wanted to play as well. With a bit of negotiating a new loop was added for Isaac's brother. As the turntable was deemed the best way of accessing this new loop Isaac placed the cross over piece in his side of the layout. This meant that Isaac had an interesting arrangement where a train starting from bay 2 of the repair yard would follow the route round that either led it to bay 1 or all the way back to bay 2.

Another thing I asked Isaac about was why his tunnel was blocked up later in the day. He explained that the steam trains had got it dirty so his men has washed it down and now they were waiting for it to dry before trains could pass through again.