Translation guide
The sound of a train, often used in children's language or onomatopoeia.
The playful sound a train makes, used with young children.
The most common Japanese onomatopoeia for a steam train's sound, used in children's songs and play.
電車がシュッシュッポッポッと走る。
The train goes choo-choo.
A simpler train sound, often used for a whistle or horn, common in baby talk.
ポッポー！電車だよ。
Choo-choo! It's a train.
Referring to a train itself in children's language.
The standard word for train, but in baby talk it's often used with onomatopoeia.
ほら、電車だよ。シュッシュッポッポッ！
Look, a choo-choo! Choo-choo!
Specifically a steam train, often associated with the classic choo-choo sound.
じいじの家の近くに汽車が走ってるよ。
There's a choo-choo train running near grandpa's house.