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Lublin, Poland.
CIty of Lublin has a population about 350,000 and it is the largest city in Poland without tram network, however it operates an extensive trolleybus network.
Poland in general has never been very keen on trolleybuses, unlike its neighbouring countries like (former) Czechoslovakia or (former) USSR. Today there are only 3 trolleybus systems, in smaller cities of Tychy and Gdynia and this one in Lublin.
The Lublin network hasn't been very extensive until very recently. Buses used to be much more important 10 years ago and trolleybuses were just a minor side service. However today we can say it is probably the most fastly developed system in the EU.
