Read the following context and answer the question.
Context: We left Vienna on the overnight train to Venice . I had successfully managed to book a couchette for us when we were in Berlin and I had hoped that we 'd have a cabin to ourselves but it was n't to be . There were six beds in the couchette .
Question: What may be the reason for having so many couchette 's in a room ?
Answer:


They need to accommodate a lot of people .