In response to grahame points….
2. Indeed, if that were allowed, the first seriously overcrowded train would feature heavily in the media & likely put off more leisure travellers than a few ‘fully-booked’ trains would, IMHO▸ . Difficult to solve. People will return to trains I reckon quite quickly. Numbers are already on the rise.
I travelled on a seriously overcrowded train on my north east ramblings - full and standing, The media seems to have missed it