I don't know what else are you planning to do with this type of street shots. I'm just commenting on what I see, which is a 750pix wide web picture.
You've written that it was scary to take this photo with a big camera, I've suggested some ways to avoid or minimise that in your future shooting. MFT cameras, Voigtlander Bessas and tons of other small, quiet and unobstrusive gear that's perfect for street. MFT's image quality is comperable with APS-C size sensors; film cameras, when you know what you're doing, easily win with any DSLR's image quality.
I see. you were giving me advice for future pics like these. thanks for that! but it's not like i mainly shoot these kind of pictures. all in all, i do not 'plan' to go look for some great scene in the subway anyway. it just happens, and i take a picture with the cam i got. and as said, it's not just the "sensor" or "film" quality (i don't do analogue) that i value in my dslr, but also partly the big bulky obstrusive lenses i can attach to it, which give me the effects i want. perhaps i will try out some of the mentioned cameras or other ones, but now i just don't have the money.
"believe me, it takes lotsa GUTS to take pictures in the train... I was so scared^^" haha tell me about it >< I did then the whole train glares at me giving me that "damn tourist" face. I then proceeded to look at my camera and tap it saying "damn camera" acting like it was an accident, like they knew what i was saying. now that i say this and think about it they must have thought i was crazy :3