Any train that is designed to accomodate 25kV AC and 750V DC equipment (or just the former) is labelled 3xx regardless of whether it is fitted with one or both systems. All 375s/377s fit into this group but only 375/6s and 377/2s have both systems, and even then only the latter actually use AC in passenger service.
That said, 444s, 450s and 458s are also designed to accommodate AC equipment if required (despite the 4xx group traditionally consisting of DC only rolling stock) - in fact there is an HSE ruling that all new trains must be designed to accommodate AC equipment.
That said, 444s, 450s and 458s are also designed to accommodate AC equipment if required (despite the 4xx group traditionally consisting of DC only rolling stock) - in fact there is an HSE ruling that all new trains must be designed to accommodate AC equipment.
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