Both track replacement and bed upgrades, but BNSF does this all of the time and ANY regular maintenance program will have these types of items built into their yearly schedule, and one would think AMTRAK schedules would accountant for this when they built their schedules for the EB. But the increase in freight traffic, along with BNSF perhaps playing catch up in some areas is just taking a huge toll on the Empire Builder performance this summer. Since the construction will continue thru October and the freight increases are more or less year around I don't see a lot of relief next winter, better hopefully than what we are seeing now (eg. over 5 hours late into CHI yesterday!!), but still chronically late. Frustrating for a train that used to be one of the best in on time performance. C'est La Vie'