The New Student's Reference Work/Escalator

Escalator, a device often called a moving staircase, is a means of carrying people from level to level by means of a system of moving trucks which are bolted to a chain connected with a driving-wheel. The trucks have the appearance of a series of steps. At top and bottom the trucks are of the same level, so that there is practically a platform which gives passengers sufficient time to step off the escalator. A curved railing, fitted with moving belts, gently shunts them off if they do not move. An example of such an escalator may be seen at the 125th St. subway station, New York City. When desired, it may be used as an ordinary staircase.