What makes a watch railroad approved?

Watches that were approved by a railroad organization for use by their conductors were considered railroad approved or railroad graded. Of course, the railroads wanted to run on time and maintain a reputation for efficiency. By demanding that all of their employees use railroad graded watches meeting certain specifications, they could at least ensure the conductors knew the time accurately. Shop a collection of pocket watches from some of the world’s top sellers on 1stDibs.