People tend to check in during these times:
Right next to Tesco extra
New ticket machines here. Touchscreen slow. Don't read my ITSO card. One doesn't work. Validators not operational.
Don't listen to the idiot about the level crossing. Ignoring the lights is dangerous and illegal. Don't even bother.
If you're quick you can beat the metro to the level crossing. Also you can still cross until the metro has beeped, just remember to look both ways.