New answers tagged customization
The minifigures and the guns will be custom made. There are a number of sites that offer custom printed minifigs in military uniforms, and Brick Arms is a good place to start if you're after specific weapons. The LEGO Group have a policy of not creating "realistic" weapons, although both fantasy and futuristic are acceptable.
As Phil notes, the PF train motor is exactly what you are looking for: You'll also need one of the PF battery boxes and an IR receiver. You will need to modify the trains themselves to house the extra components and make room for the wires. In response to your second question, 9V, RC, and PF train track is all functionally identical. The only significant ...
The motor used in Hobby Trains is the 9V train motor. This motor is externally identical to the new Power Functions train motor, so you should be able to replace one with the other. That said, the problem with Power Functions is that where in 9V it was enough to have the train motor mounted on the train, in PF you will also need to provide an IR receiver ...
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