Waiting in line at Sky Harbor

Back on August 14th we flew to Omaha, Nebraska. Our cheap airline tickets took us through Phoenix. There were like 8 airliners queued up ahead of us. Once they got rolling it didn't take long to get us all airborne. I think there may have been a one minute interval between aircraft.
    First time I have seen a train over a taxiway. That bridge must be a hundred feet tall.