Tells the kid that the train consists of a locomotive and carriages. What is a driver's profession, who carries the train, what is luggage. Tell them that there are goods vehicles and passenger cars. Think about who rides in the food cart, who sits in the goods cart and who is in general. Consider where the passengers are going, what luggage they brought on the trip and be sure to check their tickets. Explain why a first aid box is needed in the driver's cab. Find the parents of each child. Some animals are hunters, some are herbivores, some live on a farm. All elements are replaceable.