and then when the train came by, he would hold it up, and the engineer, the brakemen, or the firemanld scoop this up. with his hand through this hoop. glen icanberry: this is called a ctc machine, made by union break and signal in the 1950's. it was installed at the dispatcher's office in fresno, california, and it controlled from resmed on this end through stockton -- it controlled from fresno on this end through stockton on that end. and what it does is you can see that there is a main line here all the way through it, and it keeps track of where the trains are, and it allows the train dispatcher to make meets with other trains going in the opposite direction or to talk with other trains going slower , and it put the inferior train on the siding. it is controlled with these levers, these upper and lower, at each end of the siding. each row of signals, there is signals in between, call intermediate that they do not control. they light up according to what these control signals are doing. it is a more efficient way to meet fast trains before they used the telegraph office where there