英語童謠中down by the station很多不懂
請問英文高手,這首童謠：
『Down By The Station』
Down by the station,early in the morning,
See the little puffer bellies all in a row.
See the engine driver pull the little handle,
“Chug,chug,toot toot!”
Off we go!
1.down by the station：是什麼意思?為什麼是『下』(down)?『by』又怎麼解釋?
2.bellies是名詞嗎?所以是puffer bellies?指的是河豚肚子像火車?還是bellies當(dāng)puffer的動詞,所以加s?那See the little puffer bellies all in a row是什麼意思呢?
非常感激您的回答!