Signals: What I don't know . . .

NW Mailing List nw-mailing-list at nwhs.org
Mon Aug 5 08:59:37 EDT 2013


On 8/4/2013 5:05 PM, NW Mailing List wrote:

> Conversely, if you're coming down a steep grade rather quickly with

> that same heavy train pushing you, you might need a significant

> distance to bring her to a stop. In some cases where blocks are

> short, it might take more than whole block to do this. In such a

> location, if you were to enter a block at speed, whose signal

> displayed "approach", you might run past the next signal at "stop and

> proceed restricting" before getting her completely stopped. I believe

> this would be the motivation for "advance approach" aspect. I would

> assume this would be done with a second arm with two lights on the

> diagonal that would come on whenever the top arm went to "approach".

Jim,
This wouldn't be for just a steep grade, but, for anywhere there is
a short block even if it is level.

Jimmy Lisle


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