Last night I was watching trains from my usual spot in the Art Institute northwest employee lot (if you ever see a guy in a jacket/tie watching trains around 5p, it's me, say hello) and the 4:57 (#113) left with some weird signage on the right side of the third car. 1'x1" signs with "A", "B", and "C" were spaced 10' apart on the side of the car. Any idea what this is? Some technique to board children or a tour group in quasi-orderly fashion? No other trains had such signs.
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