At 08:57 PM 4/19/07 +0100, you wrote: >Have there been any articles in the Model Engineer dealing with >these diagrams? - Roger Mason Roger, I can't recall any specifically but my guess is they were in articles by the likes of Geo Gentry, Tom Walshaw, or Bill Carter, etc. I don't recall LBSC, Martin Evans, or Don Young doing one. The last one I came across was by a fellow named John van Riemsdyjk who is kind of the Tubal Cain of Gauge 1. His analysys and version of the diamgram, which is tailored to Ga1 applications, is in Vol.100 (1978) of the G1MRA Journal. I have a copy of this, but unfortunately I have no scanner at the moment. Regards, Harry Wade Nashville Tennessee 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.