A program was sent to the City to move the monorail and have the Elf wave.
Others were sent that moved the train, too.

The little Duplo train switch is connected to a motor so that it could be started over the Internet.
The pulley arrangement was set up by Juan. At Miller Elementary we tried out the teleoperation.
After three runs of 4 seconds the train started.  It went around and around for every one to see.
But by the time two runs of 4 seconds were sent as mission through SENSORSCITY
the automatic turn off for the Duplo train stopped it on a non switching position on track.

In front is a good place for a picture of the Duplo Train.
Duplo Train Pictures