here here. =) is

Why is there an instruction for the subway engineer of the first train after the opening of the subway to signal in each race? Even the subway engineers do not know why this instruction exists.

Not to get caught in the train. Although if I stay in the tunnel before opening - I like to fuck, the monitors do not sleep, and to stay in the niche of the wall panel (yes, just where the cables lie) considering the effect of the wreck from the passing train is also no chance. So just look for technological stakes and pray. =) is
I have respect, Digger.