The mid 1980's era you chose, give or take a year or two, was to my mind the best since the early 1960's.
In 1984 you would have seen the heavyweights like 40001 on Freightliner and other duties plus the 'Peaks'....Also the last of the newly-built Class 56's running-in.
1985 Class 25's of flask and the remaining 40's from the Crewe remodelling, Octel and Llandudno Junction-Warrinnton Trip workings.
1986 Class 33's on Cardiff turns followed by the first wave of Sprinterization.
1987 red-band Class 31's on freight and old ballast to Mold Juntion spoil tip, and the green Class 47's from the GW non-celebrations, red-stripe and blue-stripe Scotrail 47's running in, Blue & Grey, InterCity and TransPennine livery coaches. Also red-band Class 37's on RMC Roadstone wagons to Hope Street, Manchester. 150/2's introduced on TransPennine trains
1988 the triple-grey liveried locos and the ARC POA wagon block trains to Ashbury's.
1989 the Class 20's working spasmodic ballast and PW rail trains. Line passed for mainline steam.
The above dates are not intended to indicate the commencement of a traffic flow or the end of an era. They are merely a guide as to what could be seen lineside.