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In page Carl Borckenhagen:

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As a first step to this goal, he favoured a union between the two Afrikaner republics, as a bulwark against British imperialism. To this effect he took the position of Secretary of the Commission from Orange Free State Volksraad, to the Transvaal Republic, in May 1887, and led the discussions on this question. Borckenhagen facilitated the meeting of President Reitz with President Kruger of the Transvaal, at Potchefstroom. This resulted in the conclusion of a railway convention (8 March 1889), strategic alliance and trade agreements between the two republics.[2] [3]