Signals: What I don't know . . .

[NW Mailing List]

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