Current Hiawatha schedule -- two train sets.
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We know that Borealis requires two train sets for a total four -- two Hiawatha + two Borealis.
The challenge with Borealis replacing 1 of 7 Hiawatha each way is that you end up with a Hiawatha train set in the wrong city.
Here's how things look if the Borealis trains are dedicated Borealis-only equipment (red bold font):
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There's no equipment in Milwaukee to do the 1:05pm southbound. The green Hiawatha trainset is sitting idle in Chicago but you need it in Milwaukee. Two ways to solve things in this situation:
--Deadhead the green Hiawatha trainset behind the Borealis both ways. Essentially the green trainset would do what it does today prior to Borealis. It would be nice if the green trainset could instead run as an additional revenue frequency but we're not yet at the point where more CHI-MKE-CHI trains are allowed.
--Have a
third Hiawatha trainset sit in MIlwaukee which only covers the two trips in white. Painfully wasteful.
I'd be pretty surprised (and a little sickened!) if a third Hiawatha set was acquired just to do a single existing round trip, so in this scenario I can't come up with any reasonable option but the Hiawatha set being pulled along behind Borealis.
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Would it help if the Borealis trainsets were used on some additional Hiawatha runs? Not really -- you still have the same fundemental issue of no train in Milwaukee to run the 1:05pm southbound / 3:15pm northbound. By using Borealis on other Hiawatha runs the green Hiawatha set #2 could be mostly replaced by Borealis, only needed for that mid-day gap and idle the rest of the day, four trainsets total.
But in this scenario there's an issue where the Borealis trainset overnights in Milwaukee but needs to originate Chicago the next morning. And again, you may think "but couldn't that mostly idle green Hiawatha set be used so Borealis doesn't overnight the "wrong" city?" But once again we're in the position where the idle green Hiawatha set isn't where you need it to be to fill in and let the Borealis train set terminate in Chicago each night.
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In
theory if the only difference for the Borealis was a cafe car then it would not matter which train sets spent the night where. The cafe car would be ditched in Chicago in the evening before the train headed back to MKE, and in the morning it would be added to whicever train set was positioned for the 11:05am northbound for the trip back to MSP. But in that scenario you'd truly be rotating all the Hiawahta equipment so that means somtimes Venture coaches to MSP plus potential equiment issue with Hiawatha being push-pull and Boralis not. And again that's only if all equipment was equal, no variation, no state ownership or pool participation, so that makes this idea unrealisitc as well.
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So across all these possible scenarios by far the most likely seems that a Hiawatha set will be repositioned behind the Borealis each direction, essentially mimicking the revenue trips it currently runs but Borealis is replacing. That two dedicated Borealis train sets (as expected) and the two existing Hiawatha sets cover the six remaining round trips.