坐火车去上海怎么说英语

To go to Shanghai by train, you can say: "I want to take the train to Shanghai." or "I'm going to Shanghai by train."

Alternatively, you can also say: "I'm going to catch a train to Shanghai." or "I'll be taking the train to Shanghai."

It's worth noting that "train" can be translated as either "火车" or "列车" in Chinese.