Route relations that can terminate at more than one platform of a station

How should I tag a route relation which has termini where two different platforms can be used for terminating? Do I only add one of the platform/stop sets to the relation, or do I add both?

(Also, should the stop numbering in the relation be "stop_1" or "stop:1"—the English and German wiki pages contradict each other on this—, or should it be omitted even though it gives ambiguity if there is more than one stop for a station?)