DB is a job program. Nobody at DB cares.
For Deutsche Bahn, freelance contracting jobs in their IT famously always require 2+ years experience in train infrastructure companies as a hard requirement. Not joking, this is a common pattern in their job ads. Look at this ad, where they are looking for a Go/React/RabbitMQ expert: https://www.freelancermap.de/projekt/senior-fullstack-entwic...
Surprising but train drivers and operators also like to go home on time.