trolleybuses in Derby
... that trolleybuses in Derby last operated in 1967, but there are still five preserved by collectors?
... that <b id="mwEK8"><a href="./Trolleybuses_in_Derby" id="mwELA" rel="mw:WikiLink" title="Trolleybuses in Derby">trolleybuses in Derby</a></b> <i id="mwELE">(example pictured)</i> last operated in 1967, but there are still five preserved by collectors?