I got on the train while I was still hot and sweaty.
I was still covered with sweat when I stepped on to the train.
ーI got on the train while I was still hot and sweaty.
「まだ暑くて汗をかいているままで電車に乗った」
to get on the train で「電車に乗る」
hot and sweaty で「暑くて汗まみれの」
ーI was still covered with sweat when I stepped on to the train.
「電車に乗った時まだ汗びっしょりだった」
to be covered with sweat で「汗びっしょりである・汗でおおわれている」
to step on the train で「電車に乗る」
例：
I got on the train while I was still hot and sweaty from running to the station.
「駅まで走ったので、暑くて汗をかいたまま電車に乗った」
ご参考まで！
カナダ 
