Class “N” – Caboose

NA

  • Sensing, audio, emergency braking unit (CDU) that accepts, analyzes and displays information relevant to the rear of train
  • The NA provides audible alerts and displays to assist the engineer operating the train and is equipped with emergency braking feature in the event normal brake capability is lost
  • The arming feature prevents unauthorized use of the emergency braking device (4/99)

NB

  • Receiver Display Unit (RDU)
  • A device mounted on the control stand in the locomotive to receive, analyze and display information as transmitted by the SBU
  • The RDU provides audible alerts and displays to assist the engineer in train operation (4/99)

NC

  • Communications Logic Unit (CLU)
  • A device located in the short hood of the locomotive which accepts and analyzes radio messages transmitted from the rear of the train by the SBU
  • After the messages are analyzed the CLU forwards the information for display in the cab of the locomotive (4/99)

ND

  • Input and Display Unit Unit (IDU). A device mounted on the control stand in the cab of the locomotive to display information which has been sent by the SBU and analyzed by the CLU
  • The IDU provides audible alerts and displays to assist the locomotive engineer in the handling of the train (4/99)

NE

  • Caboose mounted on eight wheels and longer than four-wheel caboose, but of the same general design (1/17-10/66)
  • All cabooses (1/73-4/99)

NF (Rear End Device)

  • A device mounted on the trailing coupler on the rear car of the train coupled to the brake pipe
  • The SBT senses brake pipe pressure, and may sense motion and direction. This information is relayed by radio to the head end of the train to a RDU, CDU or a CLU/IDU combination
  • In addition, the SBT acts as a marker to locate the rear of the train and is equipped with an emergency braking feature to be used in the event of a loss of the normal braking capability from the head end of the train (4/99)

NL

  • Light only, may have brake pipe pressure device (NLU) mounted on side of trailing coupler on rear car
  • The NLU may or not be coupled to the brake pipe. When coupled senses brake pipe pressure, and displays this information on a mechanical gauge on the side of unit
  • Primary function is to act as a marker to indicate the rear of train (4/99)

NM

  • Freight train service caboose for convenience of trainmen. This caboose is mounted on four wheels and has lookout at top over roof. It is fitted with bunks or benches and a stove for cooking and heating purposes, also tank for storage of drinking and washing water, and small tool storage boxes (1/17-10/66)

NU

  • Sense and Braking Unit (SBU)
  • A device mounted on the trailing coupler on the rear car of the train and coupled to the brake pipe
  • The SBU senses brake pipe pressure, and may sense motion and direction
  • This information is relayed by radio to the head end of the train to a RDU, CDU or a CLU/IDU combination
  • In addition, the SBU acts as a marker to indicate the rear of the train
  • The SBU is NOT equipped with an emergency braking feature (4/99)
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