If you can't find the memorial. I searched for a while but couldn't find a single reference to the exact location of the Trojan Horse Massacre memorial. I eventually found it in Thornton Road, 105 Thornton Road to be exact. Here's a map, and here's the StreetView link. :)

On 15 October 1995, government security forces and railway police killed three youths in a small Cape Town suburb of Athlone. This photo is part taken of a small part of the memorial that states "Remember the Trojan Horse Massacre" and serves as a reminder of our past, and a warning for future generations. Read more about the Trojan Horse Massacre on sahistory.org.za.