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I use this invention for railroad track time lapse work.This video shows version 1 and 2. The latest has a brake and you can put a seat on it for a free ride back if the grade is steep enough. It also doubles as a kids play thing. This video shows clips using this dolly.
vimeo.com/14307402
Since then I do all my long camera moves using the Camtrac dolly seen here: thecamtrac.com/Camtrac/