1986. The business case for the Mark 4 anticipated them also being operated on the West Coast Main Line as a follow-on order after the East Coast Main Line electrification, but after the failure of the InterCity 250 project to gain Treasury support, British Rail ordered a small number of Class 90 locomotives to supplement existing locomotives on the West Coast Main Line. The Mark 4 has gained widespread praise for its exceptional crashworthiness, something that was proven in the Hatfield and Selby crashes, where experts identified the integral construction of the vehicles as being a key factor in restricting the death toll. The Class 158 and Class 159 diesel multiple units, although superficially similar, are not based on the Mark 4 bodyshell; the Mark 4 is derived from the Class 156. The Iarnród Éireann Mark 4 push-pull carriages, introduced on the Irish railway system in mid-2006, are of a different design; they were manufactured by the Spanish manufacturer CAF. The Mark 4 was the first British Rail vehicle not to use Rail Alphabet typeface for interior signage and operating notices. Via Rail Canada's Renaissance fleet of inter-city and sleeper coaches are derived from British Rail's Mark 4. They were built for the abortive Nightstar services to Europe and were adapted by Bombardier Transportation to meet Canadian requirements. Project Mallard Between October 2003 and November 2005, Bombardier Transportation, under contract from GNER, rebuilt and refurbished the carriages under Project Mallard. Trains with rebuilt coaches became known as Mallards to distinguish them from unrefurbished sets during the upgrade programme, named after the steam locomotive Mallard, built in the 1930s by the London and North Eastern Railway and holder of the world speed record for steam locomotives. The Mallard refit gave the coaches all-new interiors with new seats, carpeting and power points at every seat. The vestibule areas lost their flip-down seats near the entrances, with perch-type seats being put in their place. The buffet coach was turned around with first class seating converted to standard. Wheelchair-width doors were fitted and the seating capacity was increased by fitting airline-style seats in place of the previous groupings of pairs of seats facing each other across a table. Additionally, GNER introduced WiFi internet connectivity as a trial from December 2003 and then into service from April 2004, making it the first service of its kind in the United Kingdom. Prior to National Express East