Daniel McCallum quotes
Hourly reports are received by telegraph, giving the position of all the passenger and the principal freight trains. In all cases where passenger trains are more than ten minutes, or freight trains more than half-an-hour behind time, on their arrival at a station the conductors are required to report the cause to the operator, who transmits the same by telegraph to the General Superintendent; and the information being entered as fast as received, on a convenient tabular form, shows, at a glance, the position and progress of trains, in both directions, on every Division of the Road.
Daniel McCallum
When the time-table is so arranged as to call for speed nearly equal to the full capacity of the engine, it is very obvious that the risks of failure in making time, must be much greater than at reduced rates, and when they do occur, the efforts made to gain time must be correspondingly greater and uncertain. A train whose prescribed rate of speed is thirty miles per hour, having lost five minutes of time, and being required to gain it, in order to meet and pass an opposing train at a station ten miles distant, must necessarily increase its speed to forty miles an hour; and a train whose rate of speed is 40 miles per hour, under similar circumstances, must increase its speed to 60 miles per hour.
Daniel McCallum