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Ehm, if I must tell the truth, I don't know what are supercapacitors.
Capacitor is electric part able to collect and keep energy, and then to release it when it's needed. It's similiar to battery, but you may load and unload it much faster and fully, alike to a battery. Supercapacitor is a capacitor of very huge capacity.
Aha, thanks! In the meantime I asked to some friends and, yes, these trolleybuses are going to be upgraded with supercapacitors (car #713 is one of these: the supercapacitors are inside that white box on the roof), but it seems they aren't used, yet.