Feedrail® FRS100 & FRS200 Series (Feedrail® '60')Door track sections are identical to straight track except with a hinged door in the bottom for the insertion and removal or trolleys. When closed, the doors are securely locked and accurately aligned with the rest of the track to form an interrupted runway for the trolleys. Hinged doors are easy to open or close by pressing pins together against a spring pressure which releases the locking bolts. Door openings are polarized so trolleys cannot be inserted in improper polarity. Track rating: 60 amperes (continuous), 90 amperes (intermittent). 10' and 5' are standard lengths. Other lengths furnished on special order.