YOU SAID:

All he did was smile as he said I like trains

INTO JAPANESE

彼が私が電車が好きだと言ったので、彼がしたことはすべて笑顔でした

BACK INTO ENGLISH

All he did was smile because he said I liked the train

INTO JAPANESE

彼は私が電車が好きだと言ったので、彼がしたことはすべて笑顔でした

BACK INTO ENGLISH

He said I liked the train so everything he did was smile

INTO JAPANESE

彼は私が電車が好きだと言ったので、彼がしたことはすべて笑顔でした

BACK INTO ENGLISH

He said I liked the train so everything he did was smile