1. Spatial layout: The spatial layout of trains should consider the mobility and comfort of passengers. For example, the distance between seats should be spacious enough so that passengers can easily get in and out of the seats and move in the car.

2. Seat size and shape: The size and shape of the train seat should be designed according to the train type and passenger demand. Business class seats are larger and more comfortable than economy class seats to meet the needs of business travelers.

3. Catering and shopping facilities: The catering and shopping facilities on the train can provide food, drinks and commodities needed by passengers. For example, trains can provide dining car service, or set up dining car areas for passengers to eat.