Do a search on ..ebay and look for "Security Lighter DV Hidden Camera"
I have used one before and they are cheap as chips
Here is one I did using a friends..
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I used one of these $9 cigarette lighter cameras to make this video under very poor lighting conditions, but notice
no glitches.
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I made this movie using SuperCam a 2.4 ghz system that came out around 2005 and sold for $250. It came with an
LCD monitor that could select the output of one of four cameras. Some of the same track as shown on the cigarette
lighter camera movie with the same poor lighting conditions.
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Notice the glitches, a condition I have found that is inherent to all the 2.4 ghz systems I have tried, the SuperCam, an RF systems
2.4ghz TC9(see peteski's movies from a TC9 system) train camera and another no name system.
I think the glitches on the 2.4ghz systems could be caused by intermittent engine pickup, intermittent shorts when
running over a turnout/crossover and by an electronic track cleaner, if one is used - I use one.
The cigarette camera lends itself well to swivelling so that view along the track is followed. The video out should be
run through a program like MS MovieMaker to remove any jostling at the start when the camera is first setup and in
my case to remove the tunnel runs.
David is right about the frame rate - if you pause where the train is passing the farm you'll notice the blurring.
If you just want to check your track work and the adjacent scenery then it should be satisfactory.
AL