It would be reestablished as the Ranelagh Golf Club in 1943, and became among the most important in the southern Buenos Aires metro area; the course was later named in honor of 7-time PGA Tour champion Roberto de Vicenzo, a longtime member.

[2] The Mercedarian Order of the Roman Catholic Church established a chapel in the town in 1938, and the Nuestra Señora de la Merced (Our Lady of Mercy) Temple was consecrated in 1939.

Ranelagh was the site of the clandestine press organized by the prominent Socialist daily, La Vanguardia, following its closure in 1947.

[3] The town's first manufacturing firm (corrugated cardboard maker Zucamor) was established in 1953, and would, despite a 1957 fire, grow to become an important provider of boxes for the Argentine wine industry.

An extensive lot surrounding the railway station was converted into an arboretum on the initiative of Eva Hajduk, and following her death in 1984, the park was renamed in her honor.