i dont know about the purple line it is kinda far from buildings but i have a frind who lives up there and i was going to stumble his aprt for him... any the brown like to red line is pritty good i say about 20 or more it is strange that when i gave it a spin in the loop that were fewer than i thought would be there.. they are mosly in the near north. any way im rambling now but there is one more i would like people to check to see if im crazy i find one in the middel of the river... thats were it comes in stongist middel of the river on the el... it is weird you would think that it would be better as soon as you come out of the builings but no... o well im rambling and im not in chicago now so i cant go stumble it..... or GPS it.... tripmate... anyway