Maintaining precision to published station arrival times and displaying the next station’s name on each of the signage columns next to the station benches so that people inside the train can view

It’s outside of the gates, the one I’m familiar with is by the side with the astronaut picture that goes up a very long elevator (between elevator and gates). Upper level. It’s in the direction of the exit going to the spy museum (mall concourse, 9&d exit)

They are in special machine, there is a sign above the machine that sells it. I think in l’enfant, the machine is the leftmost one (closest to the gates)