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I'm plagued with long pine needles that would clog the brush in a heartbeat. Any ideas? I was thinking of printing some sort of air blower using a 555 motor vectored low to the track. Or paint brushes at a front point angled out at the back.
 

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I use the 12 volt 3 inch blowers available at T/A. I shorten the cable and use the speed control that comes with this unit and mount it all on flat car. I have to adjust the speed control to not blow away my ballast!! These units do come with a flaxible mount which allows me to blow away at angles, not just forward. And I even used 3 inch metal 45 degree gas hot water heater pipe to make the end rectangular.
Can you possibly post an image?
 
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