In some cases it is possible to exchange your seat reservation before the departure of the train and in accordance with the conditions that you were informed of during booking. Not all products and services can be exchanged. Please refer to the supplementary travel details you received when you made your online purchase on SBB.ch. If you have any questions, please contact the SBB Contact Center on 0848 44 66 88 (CHF 0.08/min.) or go to a public transport point of sale.