In 1903 Carolin is selected at centre alongside Japie Krige for the 3rd test against the touring British side at Newlands on 12 September 1903.

[5] Roos, Carolin, and team manager J C Carden chose the name 'Springboks' while on tour, prompted by the emblem that the side had worn on the left breast for the first time since the decision to do so had been taken in 1903.

[3][7] In the test against Scotland in Glasgow on 17 November 1906 Carolin became the second player to captain South Africa abroad when Paul Roos had to withdraw from the team.

[8] Danie Craven in turn pointed to 'Oubaas Mark' Markotter as the coach who had popularised and adapted the formation.

[12] Carolin moved to Moorreesburg to practice law and subsequently became involved in two local sports clubs.