Originally Posted by DenverBrian

Plan B is busing people to and from concourses B and C, and the skybridge to concourse A. It's not a very efficient Plan B, but it does exist.

And no, it wasn't "budget cuts" that prevented ATL-style pedestrian connections between councourses. It was arrogance and over-reliance on technology in the early 90s when the airport was built. Pedestrian walkways were never considered in the plan. The thought was that the trains would be so reliable that such walkways would never be needed. So far, the trains have been almost as reliable as they planned, but the exceptions create the chaos you saw.