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Ask for directions at a gas station or what?

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I'm a bit confused. From what I have read, mostly in Railroad Signaling by Brian Soloman, (speed signaling is predominantly on pages 87-89), speed signaling could dictate the speed through a limited speed turnout (45 mph) by displaying an aspect such as limited clear (red over flashing green, red over flashing green over red, dwarf flashing green, or dwarf flashing green over red); through a medium speed turnout (30 mph) by displaying medium clear (red over green, red over green over red, or dwarf green over flashing red); or through a slow speed turnout (15 mph) by slow clear (red over red over green, dwarf green over red, or dwarf green). I am confused however, because, according to the definitions of these aspects, they say to proceed at normal speed after clearing all interlocking or spring switches at their dictated speed. However, it would seem to me that this would not include normal crossover switches. All of these aspects and definitions, by the way, are from the seventh edition of the Northeast Operating Rules Advisory Committee's (NORAC's) Color Light Interlocking & ABS Signals, on pages 111-112 of the book. I am hoping someone can clarify this for me--I am very confused. I am not looking to start an argument, and I appologize if I am in error here. Sincerely, Daniel Parks
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