one vehicle
Used for counting vehicles such as trains, cars, or carts. Often appears in news or formal contexts.
One car derailed in the accident.
This train is a one-car formation.
one ryō (old gold coin)
Only when written 一両
Historical currency unit from the Edo period. Restricted to the kanji form 一両.
In the Edo period, one ryō was a large sum of money.
Standard kanji form; used for both 'one vehicle' and the historical coin.
Rare kanji form; 輛 is a variant of 両 used specifically for vehicles.
Compound of 一 (one) and 両 (a counter for vehicles or a historical coin unit). The reading いちりょう follows standard on'yomi.