Radio communications in the Colton yard

This paper describes five different radio systems which are used in the Southern Pacific's large railroad freight classification yard located in Colton, California. Each of these systems is discussed in turn, with emphasis on how that system is tailored to satisfy a specific communications requirement in the operation of the Colton Yard. It is intended that a discussion of the various radio applications in this yard will illustrate the types of communications which are necessary for operation of any large classification yard.