Ignacio's Inveterate Railroad
Cosmic String Drive (Clamp Drive)
The drive system clamps the starship around a cosmic string and then rides the string between star systems. Strings have specific entry and exit points, in close proximity to gas giants. This method of superluminal travel allows the ship to travel at approximately 1,000 times the speed of light — transversing 1 ly in about 8.76 hours.
Because superluminal travel is considered hazardous to biological neurology, passengers and crew enter into cyrostasis pods for the hours of traveling the cosmic string.