Operation of the energy-supply systems must not impair the safety either of trains or of persons (users, operating staff, trackside dwellers and third parties).
The functioning of the electrical or thermal energy-supply systems must not interfere with the environment beyond the specified limits.
The electricity/thermal energy supply systems used must:
enable trains to achieve the specified performance levels,
in the case of electricity energy supply systems, be compatible with the collection devices fitted to the trains.