Signals - Approach Diverging for slow route

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Signals - Approach Diverging for slow route

Postby MattW » Wed Jan 31, 2018 5:20 pm

I understand that some weak route signaled railroads, like Norfolk Southern, will use Red over Red over Green for slower speed routes mixed with higher speed routes, it's still called diverging clear though. How is the distant signal handled? I understand that it's only ever Yellow over Green, never Yellow over Red over Green as would be the case for a speed signaling scheme. How does the engineer know which route they'll take? Do they prepare for the slowest possible route, then upgrade when they see the faster route?
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