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Thank you to both respondents. I have found some information on the Wisconson signals from The Institution of Railway Signal Engineers. The information related to the difficulties in making the signal go to Stop when power or mechanism failed. Are these the ones that montana rail link uses? The Semephores were three position but with the motor at the base of the mast for easy maintenance. With rehrad to the Illinos installation I will search the archive of Trains magazine. My modelling dilemma is that 2 position signals are easy to model with mechanical linkages. I have some pictures of 2 position signalling in use on the SP around the 30s some of which is air operated and some of them mechanically. This does not give me any info regarding the positioning of the signals along the track. Maybe I should stick to colour lights! Chris
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