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By car: Park in Kufstein, take S4 to Langkampfen
By public transport:
BRB to Kufstein (Guten Tag/Bayern Ticket*), then S4 to Langkampfen.
The S4 runs hourly at xx:12 (20 mins after BRB arrives). The tickets cost €2,10 each for a group ticket (up to six people) or €2,60 individually. These can be booked online with ÖBB, best to do so on the train. The tickets are valid for one journey at any time on the day.
* Only cheaper if using the Storck DB discount, use two vouchers (€20 off plus chocolate for €4) per ticket. This means a flat €7 per person for any 2+-person ticket.