The
British Rail Class 166 Turbo Express is a fleet of
diesel multiple units (DMUs), originally specified by and built for
British Rail, the then
United Kingdom state owned railway operator. They were built by
ABB at
York Works between 1992 and 1993. The trains were designed as a faster, air conditioned variant of the
Class 165 Turbo, intended for longer distance services, and, like the 165s, belong to the
Networker family of trains. They were originally known as
Networker Turbos to distinguish them from the electrically propelled members of that family.