''add'' to add money to the account, ''check'' to display the current money value to the player, ''buy'' to let the player buy a ticket and ''pay'' to let the user pay the owner(s) of the train. In the case of buying or paying, if the player can't buy a ticket, they are ejected from the train. To prevent the player re-entering the train, make sure player enter is disabled using a property sign as well.
add 向账户充值， check 向玩家显示当前货币价值，buy 让玩家买票，pay 让玩家向列车的车主付款。请注意，如果某个玩家没买车票，列车就会自动弹出这个玩家。为防止玩家重新进入，请确保使用属性牌来禁止玩家进入。