Thanks for your reply, David.
There was apparently a large cavalry convalescent camp East of Johannesburg for men and horses. See
www.angloboerwar.com/?option=com_content&view=article&id=469
. It would appear that this was in the area now known as Bedfordview ( where I live ). Soldiers ( Scottish Horse ?? ) encamped there planted a row of oak trees, some of which are still standing.
Reference is made to the 2 locomotives used on this line at
www.irsociety.co.uk/Archives/37/Kerr_Stuarts.htm
including photos showing wagons carrying bales of horse-fodder, an obvious requirement for a large number of horses. I understand that fodder was imported from South America and was transported inland by rail, but the railhead was some distance from the camp.
Where there is confusion is that records state that the line was about 2 miles long, and ran from the main line at Simmer & Jack mine to the camp. Bezuidenhout Valley is further than that, and separated by pretty big hills. However what is now known Bezuidenhout Valley is a small suburb of Johannesburg but originally was a much bigger farm, and included the area now known as Bedfordview.
It is my hypothesis that the railway ran to Bedfordview, and I would love proof of this !
Ced