Long(er) trains are all about operating efficiency. Yep. They maximize car use, locomotive scheduling, crew scheduling, everything to improve their bottom line. They'll try it. Yep CN, and CP are playing this new game in hopes of becoming "Number One"!
Seems all the long trains operating over the flat Midwest or miles of nothing Southwest. The BNSF does the 16,000ft stack trains from Chicago to KC on the BNSF superspeedway regularly and some probly to go all the way to LA. With the Z-train traffic at all time high its no surprise the BNSF trying out the "stack train double" as business dictates it. The Chicago end of BNSF is one amazing place. So I found 2 good examples of 16Kft passing La Plata MO at 70mph. This is a rush to witness this live trackside as there is "so much goin on with a train doing 70mph". But translates well in video too.
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