Translation:I am waiting in front of the train station.
I'm not sure. If it was just on its own. Then I might use "I wait" as a response to news of a delay (though even then mostly in D&D or other RPGs where you are describe your actions). You might also do "I wait" if you specifically specified how long for. "I wait for 5 minutes" but in this particular context when the wait is describing a location or dependent on a trigger, I'd be included to use "I am waiting at X" or "I am waiting for X" I wait would be understood but it would not be common.