Slow Approach And Approach at Leaman

[Lackawanna565]

On the west end of the interlocking the signal showed slow approach then approach on a straight route. Why does the signal do that? I know what the aspects mean.

It's near the end of the video

https://www.youtube.com/watch?v=YbvnwUapqSU" onclick="window.open(this.href);return false;

[Engineer Spike]

It might have to do with stopping distance. The slow speed signal would have the movement be at slow speed at the next signal. This would be helpful if the block past the approach signal was very short. Delaware and Hudson has this setup in a couple of places too. Remember that we are dealing with SPEED SIGNALS. The same thing could be accomplished with an advance approach, then approach. Your example is telling the engineer, "Hey, you'd better get ahold of them!"