During rush hour and in the summer months of July and August, bicycle transport on the Intercity Berlin en Intercity Brussels is reserved for passengers with an international bicycle ticket and mandatory bicycle booking.
Outside of this period, you can also take your bicycle on the domestic routes of the Intercity Berlin and Intercity Brussels. It is not possible to book travel on a domestic route.
In all cases, there must be sufficient space on the train. The train is very busy in summer, in particular, and it may not be possible for all bicycles to be transported.