Almost two-thirds of its vehicles were built in 1946–52 by the Pullman-Standard Company, and they are the oldest trolleybuses in regular service anywhere in the world.
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For nearly 40 years, the fleet comprised solely Pullman-Standard trolleybuses, a combination of new-to-Valparaíso 1952-built Pullmans (the 700-series) and, from 1954 on, a number of ex-Santiago Pullmans, built in 1946–1948 (the 800-series).
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