Am trying to book a trip from Vienna to Salzburg on the OBB website. My preferred departure station in Vienna is the 'Wien Westbahnhof' train station (it is close to where we will be staying). On the OBB website the departure choices are 'Wien' and also 'Wien Westbahnhof (U)' as well as many other variations of Wien. if i choose 'Wien' can I board at any Wien stn including Wien Westbahnhof (not sure how to know if the train stops there)? Somebody said Wien Westbahnhof (U) is actually the underground stn rather than the train station. I am very confused - can anyone clarify?