Abstract: A first on-board device installed on a first train controls an emergency brake unit. When it is determined that an actual deceleration value is insufficient in comparison with a predetermined emergency brake reference deceleration value, the first on-board device predicts a first stop location based on the actual deceleration value, and sends, to a ground control device, a first signal indicating insufficient deceleration and a first stop location signal representing the first stop location predicted. The ground control device sends the first signal and the first stop location signal to a second on-board device of a second train traveling ahead of the first train. The second on-board device invalidates a preset first run curve, over a range from a second train location representing an on-track location of the second train to a stop limit location of the second train, and generates a second run curve to control the second train.

Abstract: The problem for the present invention is to provide a data center that can allow computers such as servers or the like to be operated stably and that can greatly reduce energy consumption during operation, and a rack for storage of computers to be used therein. According to the present invention, a data center 1 is provided as a building for installation and operation of computers, and includes an intake area 10 provided with an intake device that sucks external air into the building, an exhaust area 20 provided with an exhaust device that discharges air to the exterior of the building, a dividing wall 40 that separates the intake area 10 from the exhaust area 20, a rack 30 for computer storage installed so as to pierce through a portion of the dividing wall 40, and an air flow control means that controls air flow so that air in the intake area 10 passes through the rack for computer storage 30 and flows to the exhaust area 20.