In 1955 broad lower rear fender bands, gold-colored Roadmaster deck script and hood ornament, bars on the hubcaps, and a gold-accented grille were added to distinguish Roadmaster. Horsepower was increased to 236, and a new variable-pitch Dynaflow, in which the stator blades changed pitch under hard acceleration, provided quicker off-the-line getaway. Back-up lights were now standard. Overall sales were 64,527 (which was 8% of the model year production)
(description text adapted from https://en.wikipedia.org/wiki/Buick_Roadmaster#1954%E2%80%931956)
