Interval (permissive) signal placement

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Grimace780Member since Apr-18-03 · 212 postsNov 24, 2004 3:18 PM

LAST EDITED ON Nov-24-04 AT 10:23 AM (EST)

What criteria do the North American railroads use to decide where to place permissive signals?More importantly, how is it decided how far apart they should be?Does this criteria change based on whether the line is single or multi track, freight or passenger?Cheers,
Gary Cameron
Grande Prairie "The last civilized stop before Alaska," AB
Canada

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