Running a thirty-mile railway network without telecommunications was an invitation to a high-speed disaster.
Giles Croft understood train dispatching physics with the cold clarity of a town civil engineer. Two trains traveling toward each other at thirty miles per hour on a single track have a closing speed of sixty miles per hour.
That is eighty-eight feet per second. In mountain fog or around blind dark rock curves, visual sighting distance drops below two hundred yards.
That gave an engineer barely seven seconds to identify a blocked path, throw the reverse gear, and apply hand brakes.
“Without real-time signaling, single-track operations collapse under crash probability,” Giles explained to Toby Karr, unrolling a coil of bright, hard-drawn #8 AWG copper wire across the workbench. “You can’t run trains on timetables alone.
If a train stalls on an incline or drops an ashpan, every following train becomes a lethal projectile. We need instant information transfer.”
Toby picked up a small glass object from the table. It was shaped like a bell skirt, pressed from pale green bottle-glass, with a deep internal groove and a threaded socket in the base.
“A glass cup, Lord Giles?” Toby asked. “How does a glass cup stop trains from crashing?”
