This week on Ask a Teacher, we answer a question from Sajjad in Iran. He asks: Hello, could you possibly tell me which one is correct: "I travel by train" or "I travel with train"? And is there any article about this? I couldn't find one anywhere. Hello Sajjad. When we talk about means of transport, the prepositions we use depend on whether we are speaking generally or specifically. When you are talking about general ways to travel, use the preposition "by." For example, you can travel by train, by car, by bus, by truck, by plane, by motorcycle, by helicopter or by boat.