Possible Clues:

• Huge quantity
• Many commuters forget it in traditional travelling
• Transfer to rail, and -- all carried by it?
• Unfortunately on trial, commercial travellers, the lot of them!
• Large cargo amount
• Bad driver booked, carrying gunners among 50 people aboard
• Moving stuff conveyed by a line
• Number of people being carried behind one locomotive
• Express content as school takes charge
• Rational characters maybe died, all those expecting to be late?