Pulse width modulation controllers and output stage driver circuits and related methods of communicating switching regulator mode information. The present invention is a method for producing a rail, characterized by: cooling a hot-rolled mother rail to an ordinary temperature substantially while the length thereof after the hot rolling is maintained; and thereafter cutting the mother rail simultaneously in a predetermined length with at least three cold-sawing machines. Each valley has a connecting part raised to connect between two adjacent peaks. A reforming reaction tube houses linearly the reformer, the shift reactor and the selective oxidation unit in this order.