by JimBoylan
Regarding riders with high value freight shipments, some large Class 1 railroad tariffs require the shipper to furnish a vehicle for the rider if there isn't enough room in the regular locomotive consist. This may help explain why the Department of Defense Military Traffic Management Command has 6 DODX cabooses and Air Products & Chemicals, Inc. has 1 APTX caboose in the Jan. '10 Official Railway Equipment Register. Private and office passenger cars, probably with freight car brakes, have also been used.