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The train is going to slow down coming into the station. one of the things i was noting was whether you go slower when you're in a city right? if you're on a part of track that's running through a crowded residential neighborhood than if you're sort of out in the middle of nowhere and on a big straightaway. >> yeah it can change based on some of those factors. a lot of it has to do with track geometry, whether there's a curve, whether the curve is super elevated whether or not there's crossings in the area there's a lot of different factors that go into how fast the train should be going. a lo...

>> so take me through the basics of how safety works in terms of speed. the train is going to slow down coming into the station. one of the things i was noting was whether you go slower when you're in a city, right? if you're on a part of track that's running through a crowded residential neighborhood than if you're sort of out in the middle of nowhere and on a big straightaway. >> yeah, it can change based on some of those factors. a lot of it has to do with track geometry, whether or not there's a curve, whether the curve is super elevated, whether or not there's crossings in the area, there...