https://en.wikipedia.org/wiki/Tram#Electric
https://en.wikipedia.org/wiki/Tram#Cable-hauled
https://en.wikipedia.org/wiki/Tram-train#Existing_systems
https://www.nydailynews.com/news/worst-new-york-snowstorms-gallery-1.2092689-2
https://en.wikipedia.org/wiki/Cologne_Stadtbahn
https://en.wikipedia.org/wiki/Siemens-Duewag_Supertram
https://en.wikipedia.org/wiki/Rio_de_Janeiro_Light_Rail
https://en.wikipedia.org/wiki/Sheffield_Supertram#Current_network
