Watch the all new Hornby APT full length train run with just one powered NDM. This APT is running with a single motorized Non-Driving car during a series of tests. This is R3873 plus the full coaches. The tests start out with a 15 car test, this is the 14 car train with one NDM removed and two TU coaches from the 370001/370002 set added. Find out the problems and limitations we ran into with running just one motorized NDM.