Public transport in Germany is not yet barrier-free developed everywhere. There can be problems with access because there is no lift and you have to carry the stroller up or down stairs. Also, access to buses can be difficult, as the stroller usually needs to be carried high in the bus. Talk to other passengers. As a rule, people are very helpful and help with it. In many subways, trams and trains, there are now wagons with spaces for strollers. Things get tight when there are several baby carriages in these compartments. In the trains of the Deutsche Bahn you can book special child compartments.