ocr: GUIDE RAILS OUTER RAIL STAIRS - - - - - - - - L l - - - A - L - - - - - R - 1 - - - INNER RAIL Tokeep the stairs at the correct angle during their journey, each stair has two wheels on either side that run on guide rails. The rails keep the steps horizontal as they travel upward and fold them so they can move back down underneath the escalator.
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