Bletchleyite
Veteran Member
It allows you to enter and exit a station (as in the name lol), and I've done it a few times now to see people off on platforms or to even simply use the water dispensers in Liverpool Central on a hot day. Kind of useless for most people but it's quite cool if you want to try!
A very useful use case for that would be to use the toilets, though I suppose Central is so close to Lime St that you can just go to the latter where they are "landside" anyway.