It is a trade, education, manufacturing, food, four factors, water, medicine, apparel, and various amenities that occur within the railway is similar to our current world.
. It is the commercial, educational, four inputs, food, water, medicine, clothing and various amenities. What happens inside the train, similar to our present world.
It is the trade, education, basic production, food, water, medicine, clothing, and facilities. Occurring within the train, similar to our current world.