The cruiser as a modern counterpart to the numerous third rate

What First or Second World War ship type best compares with the Royal Navy's numerous age-of-sail third rates?

Cruisers, especially large light-cruiser classes such as the Towns and Crown Colonies, best match their numerous fleet-wide role.

The useful comparison is functional rather than a literal match in technology. Third rates were ships of the line and therefore part of the capital battle fleet, but the Royal Navy possessed them in numbers that allowed broad service. In the world wars, cruisers supplied that combination of substantial combat power and widespread deployment. Town-class and Crown Colony-class light cruisers are examples of large, numerous classes able to cover many stations. The analogy is imperfect because cruisers were not battleships, yet it captures the institutional need for a powerful type that can be built and distributed at scale.