You might think so but, for example, Sheffield Supertram only took ~75% of seats out of use after this legislation was announced by Shapps on 4th June.
For what it's worth LNER for one have confirmed they are sticking with the current passenger limits as well as face coverings.
So you get the "pleasure" of not only looking and feeling a bit strange wandering round in a mask you get to do it in a carriage where thee are no more than 4 people. So nothing more that introducing more restrictions after 3 months during a time we need to be opening up - mad