You can only sync 8 Stations, the 9th will run on it's own, the 10th just sits.
MultiStation.gif (135046 bytes)
 
You can get 10 Stations with 5 cars per train.
MultiTrain.gif (127347 bytes)
 
6 Monster Racing Steel Twist by Harry
Harry1.gif (128397 bytes)
Harry2.gif (128650 bytes)