@aurora Moscow had like the largest trolleybuses network in the world, and destroyed it over a couple of years just recently (I think it was in 2018-2020)...
They claimed they'll replace trolleybuses with electric buses (why? what's the point?) but of course there is not nearly enough electric buses and anyway these would serve better by replacing ordinary buses.
In the end they had to pull ordinary buses from their routes to replace trolleybuses, and now there are huge intervals everywhere and also fossil fuels.