National Geographic : 1923 Apr
398 THE NATIONAL GEOGRAPHIC MAGAZINE Photograph by International RESULT OF A REAR-END COLLISION AT SULPHUR SPRINGS, MISSOURI Automatic train-control devices that mechanically stop trains on the safe side of the danger line when the engineer fails to do so are in daily operation, with such positive results that the Interstate Commerce Commission is taking steps to make their installation compulsory on all the main railroads. These controls warn against defects in the tracks, causing broken circuits, as well as against defects in their own apparatus. Furthermore, they exclude all trains from any block occupied by another train. The Chicago & Eastern Illinois has had a whole division equipped for several years, with a record of not a single collision on the tracks thus protected.