You are the controller of all trains coming in and out of a certain train station. You must ensure that as many passengers as you can are satisfied and that there are no emergencies. You can control the train stop lights going into and out of the station so that you can allow for custom passenger-flow. If a customer has been waiting for a train for over 20 minutes (in-game time) or has not been able to successfully make it onto a previous train, this will affect the customers happiness. If the customers happiness drops under a certain threshold, the customer will leave and file a complaint about your bad work ethic. Gaining three complaints by customers will get you fired from the job. At the end of the work day, depending on how well you have done the job, you will be paid. This pay can go towards upgrading/adding different things that the game includes such as more efficient trains or a bigger station.