noun, noun which may take the genitive case particle 'no'
aboard a vehicle; in a car; on a train
Refers to being inside or on a vehicle (car, train, bus, etc.). Often used in compounds or with の to modify nouns.
I left something behind on the train.
The people aboard the vehicle sat quietly.
Compound of 車 (しゃ, 'vehicle') and 上 (じょう, 'on, above').