Conrail sign meaning

I'm posting this here assuming it's a leftover from Conrail days and not PC or later Allegheny RR.

What does the red/yellow part of the sign mean? I think BEECH refers to a block.

Thanks,

Charles

That is a Block Limit Station denoting the limits of the block(s) in dark territory.

It is descended from PRR and PC rules, carried over into Conrail.

An ABL (Approach Block Limit) sign was placed in advance of the Block Limit.

Thank you. So the red/yellow just gets your attention? Now that you gave it a name for me, I found the standard plans.

http://www.multimodalways.org/docs/rail ... 4-1983.pdf" onclick="window.open(this.href);return false;

Charles

Also, note that the yellow is placed next to the track governed.