Deadhead
A move of equipment, crew, or both without paying revenue traffic — typically to reposition rolling stock or transport off-duty crew to their next assignment.
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A deadhead, in railroad operating practice, is a move of rolling stock or crew without revenue traffic — empty equipment being repositioned, a passenger train running empty between terminals, or an off-duty crew riding in passenger seats to reach their next assignment. The same word doubles as both noun and verb: "this trip is a deadhead" describes the move itself, "we're deadheading to Chicago" describes the act of riding without working.
The phenomenon is structural in any complex railway operation. Empty equipment piles up at one end of an asymmetric flow — empty grain cars heading back to the elevators after delivery, empty autoracks returning from final-mile terminals, empty TIH (toxic-inhalation-hazard) tanks that can't be loaded for the back-haul. Crews accumulate at terminals where they finish their hours-of-service legal cap and need to be ferried back to their home terminal. Cab cars and locomotives need rebalancing across the network. Every Class I dispatches dozens of deadhead moves daily, each one fully scheduled and paid-for but contributing nothing to the bottom line.
Operationally, deadhead trains carry lower priority than revenue ones. A deadhead might be held in a siding for hours to let revenue trains pass, picked up by another train as additional power, or routed via a longer alternate to keep the main clear. Crew deadheads — riding in coach of a passenger train, or carpooling in a railroad-provided van — have specific paid-time rules that affect crew scheduling and union contracts.
Outside railroading, "deadheading" has spread to airlines (a flight crew member flying as a passenger) and to road freight (an empty truck returning home). The railway sense is older and is where the term originated, though the entomology beyond "a head without a body to direct" is mostly conjectural.
For railfans, a deadhead is often spottable by what's missing: a single locomotive with no cars, three engines and a caboose-equivalent shoving-platform moving fast in the wrong direction, a freight consist with all empty cars in the same orientation. Catching one is a small reward — empty moves are rarely scheduled in the public timetable.