Described here. It’s only in the stations, not in the moving trains. It’s taken a long time (work started in 2007), it’s later than in other US cities, and it’s only in a few stations. Still, better than London.
About Jeremy Green
Jeremy is an independent telecommunications analyst with a strong interest in M2M/Internet of Things, with a focus on transport and Smart City applications, the use of ICT to reduce and mitigate climate change, the medium-term future of the telecoms industry, including new roles for operators, and the evolution of voice services.