You are a machinist and you have a train to drive. Your train goes around the city for a couple of times per day. People from all corners of this city are standing on the stops, waiting for you to pick them up. Some of them are going to work, the others hurry to get home, still others just want to make a journey around the city. You will take them all on board! Be careful and drive your train accurately – you are responsible for citizens’ safety. Track the hours and don’t get to this or that point too late. Your passengers are counting on you!