Prague is planing a new metro line, likely automated, in any case it should start construction around 2010 or 2011 at the latest(not finalized but Prague has a good history of carrying through with its plans).
Its Metro system is continually expanded, though its not automated because construction started in the 70's(though there have been studies on the feasibility of upgrading it to a automatic metro but its not worth the costs anymore). Most recently they added 2 stations in 2004, 1 station in 2006 and 3 stations 2008. There are many other plans to expand it though im not sure the timeline right now with the entire new line getting ready to be built.
Oh and yes they have a extensive tram system also, but that tram system is supported by the 59km long metro, with 3 lines that carries 1.5 million passengers daily, and a regional rail network serving the metro thats 515km long, 11 lines and has 158 stations(unlike the WCE its part of the same fare as the rest of the city transit) and im not sure what the ridership is but it will be high(my guess would be maybe 250,000-500,000 a day?).
Than they also have the tram system that FEEDS the metro and train stops, it has 142km of track, 560km route length, 34 lines, 900 street cars and carries just under 1 million people a day(352 mill a year). Also cant forget about the bus network, not sure of the ridership but it will be up there and the fleet probably is close to size to Vancouver(by my estimation). And since im on this subject I should add that they have a extensive 24-7 service which serves the entire city very well(bit unrelated). Also as far as traffic calming, well the expansion of the highway network within the city is the reall impressive part, but I have alreadyy mentioned that around here many times(obviously im a bit of a homer for the city, sorry)
Prague has a metro population of 1.9mill, city of 1.2mill, fairly close to Vancouver in population.
EDIT: There actually have been new tram lines opened so I got that wrong, but the Metro also is continually being expanded.
just for kicks here is a video of the new tram line recently built, again not something you can do down Broadway, and the second half of the video is a 6.2% grade which as you can see significantly slows the trams down.
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My point is that Prague is expanding their metro, not their tram network within the city core, the tram network is only expanded out in the suburbs, and their tram network acts as a feeder in to the metro and train lines.
here is a video of various tram lines in the core of Prague, tihs is probably closer to what you can get along Broadway without tunneling.
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