noun
railway enthusiast; train buff; railfan
Refers to a person who is passionate about trains and railways, including riding, photography, collecting memorabilia, or studying railway systems.
彼は鉄道ファンで、休日にはよく撮影に出かける。
He is a railway enthusiast and often goes out to take photos on his days off.
Compound of 鉄道 (railway) and the loanword ファン (fan).