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As I remember, CNW was still using lots of upper-quadrant semaphores for block and interlocking signals during the '70s. They used a 2-position lower quadrant semaphore back then for most train order signals. The semaphores were replaced with color-light signals with oval targets. In some applications the lights were arranged horizontally, in others, vertically. Oregon Rail Supply probably makes the most economical signal of this type in HO. For photos of the signals, try the C&NW locomotive pages on the Fallen Flags site: http://www.rr-fallenflags.org/cnw Also, the Mid-Continent Ry. museum has a CNW lower-quadrant signal in front of its CNW depot. You can find photos on its site; http://www.midcontinent.org Hope this helps. --John
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