siemens - airlink
If you use the subway and been able to access free internet or at least watch live TV, then there's a good chance that Siemens/pulz8 provided the the solution to make it happen.
Siemens bought one of my clients, pulz8. I now provide communication services for Siemens as well. Here is a brochure and power point presentation for their Airlink solution.
Airlink - (Siemens/pulz8 broadband solution)
Every day around the world, transportation providers and passengers are taking advantage of Airlink's high performance broadband connection. Airlink enables operators to manage train to track communications more cost effectively and with increased effi ciency while opening the door to more exciting products and services