Comment by hiAndrewQuinn

Great question! The short answer is "Beats me, ask your local transit authority." They're generally the ones who call the shots on what actually gets shown on those displays, and we are the folks who implement that downstream.

When I say "local transit authority", I mean organizations like the BART for the Bay Area, the MTA for Chicago, or the MBTA for Boston, my home town. The graphic designers in those places are often responsible for surprising amounts of the look and feel of a city's public transport, so I'm sure they would love to hear your feedback.