Technical requirements (IRL)
The International Requirement List (IRL) is a thematic, uniformly structured summary of national and infrastructural requirement catalogues of authorisation bodies and network operators from Austria, Germany, Italy, the Netherlands and Switzerland. It covers electric and diesel locomotives, and since 2009 has also included multiple units.
It describes the requirements of infrastructure and the standards, decrees, laws and directives according to which the authorities issue approvals, from individual components up to complete railway locomotives.
The IRL also contains information on the mutual recognition of approval procedures of the supervisory authorities. It is therefore a valuable aid to structuring the approval processes.