Saw an add in the N scale mags for a TV camera for N and Z scale trains. I ordered one in January. Took 4 months to arrive. Very easy to use. I want to tell you I a going to have fun with this thing. The camera itself is about 5/8 inches wide The whole assembly will fit inside a dummy engine whether it is a hood unit or a switcher. It will fit incide a caboose or even a container. Operates off of track power and needs 4.5 volts. also has a small rechargeable battery which can operate the camera for up to 15 minutes. I hope to use regular batteries so it would not be dependant on track power. Probably would have to be battery powered for DCC users anyway. This is a color camera that sends a signal to a receiver that is connected to a TV or a VCR. The adds are in both N Scale magazines. Tunnels will cause a loss of signal and so will dirty track [battery should preclude this] All in all I am very impressed. Like I said I am going to have fun with this.