I have a Bike Friday New World Tourist with road tires and drop bars. You can fast fold it into the soft bag to take on the train. However it's a bit messy to fold - the handlebars flop around and the bagged shape is irregular and bulky - so I don't find it is so handy for commuting. It is better viewed as a bike to travel with, I think. However it has road bike geometry so riding will be enjoyable. the Brompton, and other cheaper folding bikes I tested at LBSs all had too upright a seat post.
Swift (either the original from the New York builder or the licensed knock off from Xootr) also advertises that it rides like a road bike.