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A rail for a standard 7 ft high garage door is actually 10 ft long and along this rail a trolley travels back and forth to open and close your door. The rail that comes in pieces tends to cause problems because it's simply not as strong as a one piece solid rail. Over time rails that assemble in pieces cause problems with opener functions sooner than openers with a solid rail. They get much louder and effect the travel of the trolley where the rails attach to each other. Solid LiftMaster one piece professional rails are most definitely the way to go.