The E6 pair started running one-way on a Hiawatha in 1941, returning overnight; dunno if the DL109 pair did the same. But that was all there was, so some Hiawathas had to stick with steam until the E7s arrived circa 1946.
Because they bought EMD #15 - An 'AA' pair of E6A units that could double the daily mileage output in the Chicago-Twin Cities fast passenger pool. As an example, the 15 would leave WB with the Fast Mail to the Twin Cities and double back EB a couple of hours later with the EB Morning Hiawatha.for Chicago. This dayin/day out performance impressed the Milwaukee Road management.
After WWII, the Milwaukee purchased 5 AA sets of EMD E7's and 2 AA sets of FM 'Erie Builts' to completely dieselize the fast passenger pool.
Jim
Modeling BNSF and Milwaukee Road in SW Wisconsin
When did the Milwaukee Road discontinue steam locomotives on the Morning and Afternoon Hiawathas?
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