The
IRE service was first introduced in the 2001 summer timetable, due to the increasing abolition of
Interregio routes by DB's long-distance division (
DB Fernverkehr). As a result, several German states ordered
InterRegioExpress trains on the routes affected. In addition
IRE trains were also introduced on routes that had not previously had an
Interregio service (e. g. on the Stuttgart–Tübingen–Aulendorf and Ulm–Aalen routes). Unlike the former
Interregio trains,
IRE trains were classified as local passenger trains and can therefore be used by passengers with local tickets (DB Fares product group C as well as tickets issued by Passenger Transport Executives). This led however to some passengers being confused, especially to begin with, because they frequently did not realise that they could use these trains with local tickets. Furthermore, the new train type was often wrongly referred to in the early days as an
InterRegionalExpress or ironically as an
InterRegioErsatz (InterRegio substitute). However, since then, the name
Interregio-Express has established itself. == Routes ==