noun
mom who loves trains; railfan mother
Slang term for a mother who is a railway enthusiast, often used in online communities and parenting contexts.
See also: 鉄道
ママ鉄の友達と一緒に子どもを連れて鉄道博物館に行った。
I went to the railway museum with my railfan mom friend and our kids.
彼女はママ鉄で、休日はよく子どもと
She's a mom who loves trains, and on her days off she often rides local lines with her child to eat ekiben.