//I seem to remember, from my days of running a railway station, that it's an offence to remain on railway property when required to leave by any authorised agent of a railway company. Indeed, I've had people ejected from the premises by BTP officers, based upon that legislation, on several occasions. [See s.16, Railway Act 1840]//
Quite so, 'Chico. But: "If any person shall wilfully obstruct or impede any officer or agent of any railway company in the execution of his duty upon any railway, or upon or in any of the stations or other works or premises connected therewith, or if any person shall wilfully trespass upon any railway, or any of the stations or other works or premises connected therewith, and shall refuse to quit the same upon request to him made by any officer or agent of the said company, [he commits an offence]"
In short, railway staff cannot ask somebody to leave a station on a whim. The person involved has to "...wilfully obstruct or impede..." the railway officer in the execution of his duties. Attempting to board a train when entitled to do so cannot be interpreted as obstruction.
As it happens I believe that avoiding public transport where practical is a good idea at the moment. However, from next week all shops are being allowed to open. It is hardly fair to restrict their custom to those who can only get to them without using public transport. Large numbers of people are being hoodwinked into believing that there are far more restrictions than there actually are. Northern Rail seems to be the biggest culprits as far as this particular aspect goes, near enough telling people that hey are not allowed to use their services unless they are key workers and their journey is essential. This is completely out of order.