European Union Agency for Railways
The European Union Agency for Railways ( ERA ) is the agency of the European Union ( EU ) that sets mandatory requirements for European railways and manufacturers in the form of Technical Specifications for Interoperability , which apply to the Trans-European Rail system . 
<triplet> European Union Agency for Railways <subj> agency <obj> instance of <triplet> Technical Specifications for Interoperability <subj> Trans-European Rail system <obj> facet of