Al has a question on HO signals:

“Hey everyone, would anyone know of the best dc signal system to change lights in blocks. Train in the block with one light green, block two light red, block three light yelllow and also to have trains stop on red and slow in yellow? I remember that many years ago there was a section of track that was able to do this, but that seems to be no longer available? Any help would be appreciated. Thanks and happy railroading to everyone.”

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