The plastic rail kept upkeep at a minimum and allowed the use of a simplified signal system in place of earlier complicated switches and signal signs. The track was divided into five-hundred-mile sections. Every two hours a train left one of these sections, or "blocks." In leaving, they allowed the plastic to turn green or "open," signaling the next train to depart. As long as the pilot could see green track ahead and red behind, he was safe to travel "on time." Gyroscopic balancers, huge head and tail fins, and constantly maintained speeds allowed a mono to travel safely on a single row of centered wheels.--ED.] End of Project Gutenberg's One-Way Ticket to Nowhere, by Leroy Yerxa