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fresh calls for voting protections. this has been a theme throughout his administration and one in which he will use this opportunity in selma to call for that. again, the white house says that president biden will be delivering remarks when he is there. he wants to make sure that we are not erasing history, we are commemorating it. that's what the white house says about his remarks. also, he will note that voting rights is integral to economic justice and civil rights for black americans. so those are the through lines for his remarks, but he is also expected to cross the bridge. th...

Can combine it all with things on the ground and put that into one simple graphic that feeds to the engineer showing him or her how fast he must get on the brakes to stop before reaching some sort of obstacle up ahead and if the engineer does not do that then all of that information through a computer system will take over his train and automatically slow it down or even stop it to avoid a problem out there. that is the positive part of positive train control, anderson. >> do officials have a sense of how many different types of accidents this would prevent? >> there was congressional analysis...

Next part of it, relay stations along the tracks themselves. to tell them where switches are p. what position they're in. potential hazards, crossings and overall ground patrol effort which brings all of that information together and turns it into one simple graphic that would show up for any engineer out there. showing him or her precisely when the train need to be slowed down. how much time it'll take at that weight and at that length after train, that sort of thing and if they do not responding with if the engineer does not showdown when the hazard is up a ahead. commuter would take over. t...