In some cases, a single physical object – acting as a sort of key, though it is called a token – has to be held by the one train using the single track stretch, and the driver hands it over when they reach a double track. No train is allowed on the single track without the token. It is an excellent safety device.He had another idea. "This is not the same, but using modern phones, the drivers can establish who has right of way, and woe betide any driver that does not cooperate in that! He usually would end up in a collision!" But, George, that is not the same as making a loop in a long tunnel." True, but there is nothing to stop you having the tunnel widened, or made into a twin tunnel, for a suitable stretch of line. You calculate the longest practicable length of a train, say using elongated flatcars, and a margin front and back, then space for the points and curves at either end; and "hey presto", you know how long you need for a track loop. Plan your tunnel machine to do two. Just the head of it this time, which was almost all she could take it seemed. She kept stroking it with her hands, and sucked on the head like an expert, letting it go in and out of her mouth now and then, her head bobbing up and down, then back in so she could suck some more.My head started to spin, and I thought about saying something, making a bad joke or something, but then I thought; you know what, if this is really happening, then just let it. So I kept my mouth shut.She kept doing it that way for several minutes, and it felt great. She did everything right, using lots of spit and making sure her teeth was out of the way. Then she started to lick up and down the shaft, letting her tongue run all the way from the tip to the root and then back up again. Up and down, sometimes letting her tongue go sideways, sometimes using just the tip of her tongue and sometimes the whole front of it.While she was doing that, she grabbed the head of my dick with one hand, squeezing and massaging.
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