Bournemouth Corporation buses had different coloured 'via point' blinds until not that long ago (
photo not mine)
London County Council trams had 3 lights above the destination box in the early years of electric trams - different routes would have a different combination of lights and colours (
photo, also not mine) - they introduced service numbers before the 1914 war.
and Amsterdam trams still have a colour code for each route (
photo - again not mine)
there were a few batches of 800+ numbers on LT country buses, as with the new towns, they ran out of 300+ numbers - Stevenage, Harlow and the Welwyn / Hatfield patch all had some.
There were also a few 851+ numbers on the south side, not as many as on the north side (from memory, 851 - 853 at Crawley and 854 for Orpington - Ramsden Estate) - and they managed to replace them with recycled 400+ numbers relatively early on (the 854 became 493) as infrequent routes were withdrawn in the 60s.