Hi dr5euss,
I don't think you're very likely to move much very on 9 volts dc!
Unless I'm reading your text wrong are you considering running this on rechargeable cells? If so, consider series connecting two 9 volt cells to give 18 volts. By the time the controller has taken its small portion of the volts available for internal use you should end up with around 14 to 16 v available.
Current available will be a big issue too. Locos will draw between 0.5 and 0.9 amp each. Move a set of points or operate the uncoupler (Assuming the point and uncoupler are solenoid type e.g. Ponts are Peco/Hornby type) and your rechargeable cell/s will very quickly discharge.
I have never seen any controller working from a rechargeable cell and at 9 volts? Though this doesn't mean there isn't any!
I have a very simple controller circuit using two power transistors etc which worked extremely well on my former layouts fiddle yard control panel. It's designed to work on 14 to 18 volt ac or dc input as is the norm for controllers. Look on my web site (Electrical Page at the bottom) where I have upload the circuit. The controller circuit is built onto a piece of stripboard and the control knob and its variable resistor (pot) can be located remotely, though don't allow the leads between the pot and the board to become to long!