MetroRail trains started running earlier this week on the tracks along Airport Blvd.  They will be in service on weekday mornings between 5:25 and 9:25 am and weekday afternoons between 3:45 and 7:42 pm.  Trains may appear at any time with little warning.  Please exercise extreme caution at the railroad crossing at 51st St and Airport Blvd, and remember that it is illegal to stop on, or within 15 feet of, the tracks. Look both ways before proceeding!