Standing next to the locked train, for the long seconds before it starts to go and leave me on the platform, is frustrating. This is the definition of maximum waiting time to the next train.
In life as in business, missing the deadline always comes with its penalty. It cost time, money and prestige. You can be frustrated, but it will be better if you will learn your lesson. Either way, the next train will arrive, and it seems like you are the first in line.