I knew this project was going to turn into a massive Clusterf^&k the first time I saw the announcement. I still think the entire Great Hall project to put most of the space post-security is incredibly ill-conceived and I hate that I might ultimately be proven right. The only real benefit would be to straighten out the security checkpoints and increase passenger throughput but I don't see how forcing everyone to schlep to the north end of Level 6 is going to make that process any more efficient than what currently exists.
Maybe it's just me but in some of the comments here it seems like there's confusion with the various trains at DIA. As far as my memory goes (back to 1995) the automated people mover between the concourses has always run with 4-car trains. If anyone remembers differently then by all means correct me but I recall that capacity was adjusted through frequency, not by adding/subtracting cars.
RTD's commuter rail service between DIA and Denver started running in Spring 2016 with 2-car trains. Those were expanded to 4-car trains in January of this year (same schedule and frequency).
Unfortunately I agree with everything you say about this project. On top of this project the Pena widening project should start next year as well and of course will start with the portion near the airport which isn't as bad as the two lane stretch from Tower to I-70.
It has always been 4-car trains in the airport, going back to 1998 for me. The RTD trains are currently 4-car trains with almost all of the stations between the airport and Union Station unable to handle longer trains since the stations were only built for 4-car trains with the exception of DIA and Union Station.
318, 319, 320, 321, 332, 333, 388, 707, 717, 722, 732, 733, 734, 73Q, 735, 73G, 738, 7M8, 739, 752, 753, 742, 74L, 744, 762, 763, 772, 77L, 77W, 789, 142, CN1, CR2, CR7, DC8, DH2, DH8, D8Q, D10, D95, EM2, ER3, ER4, E70, 100, J31, M11, M83, M88, M90, SF3