i have a question. im dont know much about trains compared to alot of you. but along the tracks you will see those lights that are either red, yellow, or green. now what exactly do these mean. at switch lines, and the light is red, does this mean that the train is going to stop. and if it is yellow does that mean its going to go through slow. and of course green meaning it will keep going. id like to know cause i kinda get tired of waiting for a train at the switch up not knowing if its gonna stop or not.