Back in 2004, we had a special edition £2 coin to mark the bicentenery of Trevithicks locomotive. That was the one that ran on the Pen-Y-Daren (sp?) ironworks. The biggest problem was that the cast iron rails kept breaking under the weight. Alan MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.