Using Google Earth, locate McChord AFB, adjacent to Fort Lewis, and you'll see a BNSF rail line running north-south along the west perimeter of the air base. Follow it until you're just past the south border of the air base and you'll see a wye track going southwest toward Fort Lewis. This leads into what appears to be a freshly-ballasted 8-track rail yard. From there the tracks lead to a large load-out area, and there's also a building with a red roof that is probably a new two-stall enginehouse. Most likely the locomotives are inside it.
Much of the rest of the track, which mainly serves warehouse areas, appears to be out of service, as is the physically separate track on the west side of the post, where there are portions of track pulled up.
As for Fort Bliss and Fort Hood, both posts have active rail operations; however, old track has been removed as the Army built new load-out areas for taking units out via rail and bringing them back in again.