The idea is to use airborne infra-red cameras to collect evidence, which could then be used to prosecute vandals who deface property at night.
A company spokesman said drones would be tested at rail depots soon.
But it is not yet clear how Germany’s strict anti-surveillance laws might affect their use.
Graffiti is reported to cost Deutsche Bahn about 7.6m euros (£6.5m; $10m) a year.
Full Story: German railways to test anti-graffiti drones