How to get to B-IT.

Tickets

You'll have to get a ticket before proceeding to the platforms. The ticket you'll need is "Preisstufe 1b [CityTicket Köln/Bonn]"; (2.20 EUR).

Tickets can be purchased at

Other types of ticket are also available, e.g.:

You can find a map of the railway station here. The railway station is the magenta box marked with "DB", and the entrances to the underground station are marked with a blue-white "U"-box, and the SWB ServiceCenters are marked with "SWB". If need to know how to get to the central station (for example, if you are arriving by plane), have a look at this.