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I've always been curious about why I'm seeing less and less of the wig-wag-type crossing signals? From what I've heard they were and still are more prevalent in the Northeast than elsewhere, and it's been a long time since I saw one at a grade-crossing in the Midwest. (I have seen them in Wisconsin and in Indiana, but not recently). Is it because their mechanical design was too prone to failure and/or they were too difficult to maintain? I know it's usually the case that the state decides what type of crossing protection is to exist at every public grade-crossing and then it's the RR's job to maintain them (which burns me up every time I hear a TV story that blames the RR for less-than-adequate signal protection after a grade-crossing accident). Maybe fewer and fewer states are considering the wig-wag design appropriate?
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