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In Russian when you say "The train is at platform 2", is на used?

Should not this be
С какого платформы отходит поезд?[/quote]

No.

Platform in Russian is a feminine noun: платформа

Какая платформа - nominative.
C какой платформы - genitive

No.
The logic is a choice from the range of numerals (from 1 to 12) and therefore it's plural "который" accordingly[/quote]

What do you mean 'plural'? There is no plural here.

Well the only way I've been taught is that который is the relative pronoun. I think the confusion lies in the fact that in English we say 'which' for both какой and который.

Although I see what...