I was under the impression that it was all Morgan track, and they took down all the Arrow track, and just had it replaced with nearly-identical Morgan. Oh well.
Do you have any pics of what you mean with the color difference? And I bet if it is different, and there is Arrow track on (I thought there wasn't) it's probably caused by old paint underneath showing up a little bit, or something like that (ie: not enough primer).
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Next up: Stupid human tricks! Followed by: Stupid pet tricks!
Why can that never happen?