A1

Meanings

Adjective

• In good health.
• In excellent or top condition.
• First-class.

Noun

• Under the International Union of Railways ("UIC") classification system, a steam locomotive that has two coupled driving wheels followed by two trailing wheels, with no leading wheels; also called an 0-2-2.

Origin

• From various rating systems, as that of Lloyd's of London or the condition of insured ships. First attested in 1837.