choo-choo

The toddler waved as the choo-choo passed the station.

汽車ぽっぽが駅を通ると、幼児は手を振った。

Grandpa bought the little boy a wooden choo-choo for his birthday.

おじいちゃんは男の子の誕生日に木の汽車ぽっぽを買ってあげた。