When using a public transportation card with a monthly fee, it is common for it to lock up for several minutes after use to prevent it from being used by more than one person.
Some services, like the Moscow bus network and the subway, set this to a reasonable 10 minutes.
But if you happen to enter a Russian Railways station, realize you forgot some stuff at home, go back and try entering a station again, you will be hit by an unpleasant surprise that _their_ lockout period is *40 minutes*.
@ksmiles Yeah. Out of all methods of transportation around the city, the railways are the worst. Sadly, they're also the most efficient when it comes to getting from where I live to work and back.
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