noun
railroad security officer
A former official position in Japan responsible for maintaining public safety and order on railways, similar to a railway police officer. Now largely historical.
鉄道公安官は駅や列車内の治安を守っていた。
Railroad security officers maintained public safety in stations and on trains.
鉄道警察 refers to the modern railway police force, while 鉄道公安官 is a historical title for individual officers under the former system.
Compound of 鉄道 (railway), 公安 (public safety), and 官 (official). The term reflects the historical administrative role.