Units from Capitol Heights, Seat Pleasant, Chapel oaks and Boulevard Heights participated in a mock incident at the Capitol Heights Metro Station. The drill was scheduled to demonstrate to a delegation of visitors from Thailand how emergency personnel handled an underground subway incident. The delegation was preparing for how they would deal with emergencies in a subway system to open in their country later in 2004. The simulated incident involved a train derailment in the tunnel between the Capitol heights Metro Station and the Yost Place Fan Shaft. The simulated incident included a fire and mass casualties.