They have been doing construction on the "d" gate airport trains. On 3/8/09 I rode out to the "d" gate, they have "new" (or upgraded(?)) equipment: (1)brighter lighting, (2)better signage, (3)"nicer" announcements--the seating arrangement seemed to be the same. [On arrival at las on 3/6/09, the train I rode on was the "old" equipment, so maybe only one "line" (of the two tracks) has been given the makeover?]