The two conurbations are similar; the Welsh Capital has a population of just under 560,000 ( including Barry and Penarth) whilst greater Sheffield is 580,000. Both were historically developed round heavy industry, Cardiff trading in King Coal and Sheffield being the city of Steel.
So let's start with "new" technology:-
ELECTRIC BUSES - Cardiff
ELECTRIC BUSES - Sheffield
PRINTED TIMETABLES - CardiffFive area booklets with just a touch of the Beardef Bus Beautifier of the Bush about them (a k a Stunning by Stenning?). But before our readers slaver too excitedly, it is worth noting that these are timetable books "lite".