1970s - 1990s

Contraceptives were illegal in the Republic of Ireland at the time. The Irish Women’s Liberation Movement triggered a media storm when they travelled by Enterprise to Belfast to purchase contraceptives.

By July, all Enterprise services had intermediate stops and later that year air-conditioned coaches were introduced.

Following the completion of the Belfast Central Line Project, which involved the relaying of track along the route of the former Belfast Central Railway, the Belfast terminal moved from Great Victoria Street to the newly constructed Belfast Central station.

In 1980, two new General Motors Diesel–Electric main line locomotives and a train of 8 BR Mark IIB coaches were introduced to the NIR Enterprise service.

A new CIE timetable was introduced with all Enterprise services stopping in Drogheda.

The Railway Preservation Society of Ireland (RPSI) begins its Steam Enterprise public excursions between Belfast and Dublin.

By June, Enterprise offered six services each way daily.

Peace Train organisation was set-up in response to bombings and security alerts along the Belfast-Dublin railway line.

The service was upgraded with a new timetable and new coaching stock from French train makers De Dietrich Ferroviaire (now Alstom DDF). At this point the service, which had operated under either the IÉ or NIR brands, was branded separately as Enterprise.