Matt, the ballast is GAUGEMASTER OO/HO mixed with N.
I have now installed the revised yard lighting and a small signal box controlling access to the steelworks. All electrical work is complete and the foundations are in place for the final installation of the Coke Oven and conveyors.
These pics show the revised trackwork.

I have kept the small coal yard to the right of the picture as I think it complements the industrial setting.

The MGR discharge shed - MGR trains run continously around the layout on an inner freight line.

The Quencher. The idea being that hot coke from the Coke Oven is shunted to the tower in a special wagon - once inside, cold water is cascaded onto the coke from overhead to cool it.

The steelworks buidings temporarily in place. The camera lens has distorted the chimneys, they are actually dead vertical! Class 37s wait with coal trains in the Exchange Sidings.
