Where ya comin’ from? Where ya goin’ to? Where’s the station at? Questions like these also pose the question of how you use where in writing. When where is used to refer to a point of origin, the preposition from is required: Where did she come from? When it is used to refer to a point of destination, the preposition to is generally superfluous: Where is she going? rather than Where is she going to? When where is used to refer to the place at which an event or a situation is located, the use of at is widely regarded as regional or colloquial. So unless you want to convey the flavor of speech, write Where is the station not Where is the station at.
