Can I remotly control the points on PF train tracks? I'm interested in investing in power functions based trains, but want to automate switching points. Is this possible? What is the cheapest / easiest way of achieving this?
There is a pure way of changing the points at a track. It requires as few pieces as you like: a motor and two technic beam/bricks. This video demonstrates the principles of point changing with a NXT motor and will work with PF and RCX.



You can use Mindstorms to program the events that trigger the points to change, it will cost you extra but there are benefits.