Apologies if there's already a thread on this (if there is I can't find it), but as I recall the Class 91s first entered service on King's Cross-Leeds services in March 1989, initially with HST sets but with a 91 in place of one power car while the other power car effectively became a surrogate Driving Van Trailer, then the Mark 4 sets were introduced on the route with the 1989/90 winter timetable in October of that year.
As far as electric services to Newcastle and Edinburgh were concerned, IIRC they were planned to be introduced with the May 1991 timetable but there were various complications that led to a phased introduction of the 91s on the Newcastle and Edinburgh services between May and July of that year so BR had to issue a temporary timetable to cover that period.
As far as electric services to Newcastle and Edinburgh were concerned, IIRC they were planned to be introduced with the May 1991 timetable but there were various complications that led to a phased introduction of the 91s on the Newcastle and Edinburgh services between May and July of that year so BR had to issue a temporary timetable to cover that period.
