Terms in alphabetical order

OBE

Object !

Object code

Object control !

Observarion railcar

Obstacle detector !

Obstruction detector

OBU

Occupancy sequence !

Occupied !

Occupied track

Occupied track

OCDN

ODO

Odometer accuracy

Odometer accuracy !

Odometric confidence interval

Odometric confidence interval !

Odometry !

Odometry reference location !