I wondered what reasons The Girl had.

The shuttle was already loading when our restaurant contingent arrived. I made my way inside, found a seat, and threw my bags up onto the safety-webbed conveyer that would carry them up to the roof luggage hatchway. Fifteen minutes later we undocked. Passing beneath the guns and missile ports of the Terran Confederation battle platform floating overhead like a brooding predator, we started across the final fifty-kilometer leg of our journey to the Quadrail station.

I gazed out the window as we approached, half listening to the murmurs and twitterings from the first-timers among us. The Quadrail Tube lay across the starscape straight ahead, a shiny metal cylinder stretching seemingly to infinity in both directions. Despite its sheen, it was strangely difficult to see until you were practically on top of it, which was probably why a hundred years of outer-system probes had drifted through the space around Jupiter without ever noticing this thing sitting just beyond its orbit.

The ends of the Tube were even harder to see, fading away in both directions as the whole thing receded into the strange hyperspace where most of it lay. There had been a few attempts to follow the cylinder out to those vanishing points, but no matter how far you went, the Tube seemed perfectly solid the whole way. A trans-optical illusion, the experts called it, a fancy way of saying they didn’t have the foggiest idea how it worked.

But then, as far as I knew, none of the other alien races who traveled the Quadrail knew how it worked, either. The Spiders who ran the system were the only ones in on the secret, and they weren’t talking.

The station itself was an extra-wide spot in me Tube, five kilometers long and two in diameter, with hatches of various sizes set in neat rows around its surface. Current theory held that it had to be built wider than the rest of the Tube in order to bring it more solidly into normal space. The more cynical view was that the Spiders had to do something to justify the trillion-dollar fee they charged to put a Quadrail station into a solar system.