join uing us a khristine dun an information officer for the transportation authority. , the story that we just watched, christine, but cal train running the peninsula on commuter rail and you have a big area to cover. >> yeah, that's right, cheryl. we go from san francisco to san jose. it's about 50 miles. we go through a number of highway pop pew laulated areas, through downtown and 50 railroad crossings. something people need to be very aware of the train. we operate 92 trains a day, and it's something people need to be aware of and careful with on the railroad tracks. >> the temptation to walk on the tracks, they are quieter these days, and with the ear buds, you will not here it. >> we have operate a push-pull system so the locomotive is on the southern most end of the train, and if the train is going north, you will not hear the train until it's right on top of you. >> we have a video, an example of the pedestrian gate. the trains go by fast, so as we watch the video, i want to keep talking about the fact that these -- the train arm comes down for just a short amou