When you take Saginaw Yard into account, there were/are actually 4 coaling towers on the Ludington-Saginaw mainline, from west to east:
Ludington Yard, Baldwin, Lake, Saginaw Yard.
Actually, was the Saginaw one demolished in the last couple years?
My guess is that Ludington Yard needed a coal tower to service the various steam switchers working the yard and more importantly, the three ferry slips. Baldwin seems like a logical place being such a major PM junction. I don't think too much of the traffic through Baldwin was time sensitive, so it probably wasn't a big deal for the locomotive from a north-south train to cutoff and take coal from the tower located parallel to the east-west line. Since there were wye tracks in at least three of the quadrants, getting to the coal tower shouldn't have been too difficult no matter which direction the locomotive was facing. And seeing how, at least during the PM and some of the C&O era, I think more traffic was on the E-W line, it probably made sense to put it parallel to that one.
I believe similar to the Baldwin tower, the tower at Lake could fuel locomotives on the mainline as well.
Maybe there's a much better explanation, but this is my surmisement (surmission??).
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