In Germany, a passenger is allowed to carry a large piece of luggage in addition to a piece of hand luggage on Deutsche Bahn trains. Large pieces of luggage are items (suitcases etc.) that can be carried by one person but are not hand luggage. Items that could obstruct passage for or inconvenience other passengers or cause damage may not be transported. Passengers are responsible for supervising their own luggage. In principle, carrying instruments on trains is no problem as long as their size and quantity complies with the conditions of carriage.
In some European countries, an additional charge must be paid for larger items or instruments, for example when traveling by Thalys or Eurostar.
ATA Carnet - forms, IHK Berlin (German)
Certificate musical
instruments
form 221, BfN
Travelling-Exhibition
Certificate
form 226, BfN
Tips ATA Carnet, IHK Berlin (German)
Checklis ATA Carnet
pdf
Checklist Temporary
use without ATA Carnet
pdf
Transporting works of art
Germany - Switzerland
pdf
Generalzolldirektion
Central Information Unit