Independent Study- George

My independent study is a bit mixed up. I rushed into a topic but now I am having my doubts about it. I can't wait to start but I am going to wait until I am happy with my topic. Theo's topic is an interesting one because I think it is more of a hobby topic (Literally!) and I think he will have to comb very deep or end up just listing products. The topics I am umming and aahing about are The London underground and The Great western Railway. Which do you think I should use? If I use the GWR I already have a good BSWQ.