Just a bit of constructive criticism about your blog post: it's not exactly clear what your application does. Especially if you don't know what Caltrain is. I

Just a bit of constructive criticism about your blog post: it's not exactly clear what your application does. Especially if you don't know what Caltrain is. I, for example, thought that it was something to do with personal training. Until I googled it :) After reading your first paragraph the reader should have a general idea of what you're talking about...