In the UK the seats are usually totally different (e.g. http://img3.photographersdirect.com/img/13886/wm/pd3295300.j... vs. http://farm4.staticflickr.com/3566/3467484793_42379b7d56.jpg) - with the most noticeable aspect being that you will fit less first class seats into one train carriage, due to size.