|Source: somewhere on QR's website|
BrizCommuter is unsure of why such an odd design is in place. Could it have something to do with broken down trains pushing other trains? Could it to be allow locomotives to run around freight/maintenance trains? Is it due to a curve in the track? Or did the track planners just have a bad day? Certainly it is not designed for high capacity running of EMUs!
So how should this terminus have been designed? As previously mentioned, for maximum capacity the crossovers should be placed as close as possible to the platforms. Scissors crossovers (such as on the approach to Ferny Grove) allow for the highest throughput as they are located in the same space as just one crossover. On the downside, the diamond crossing can suffer from track wear and tear, and also adds wear and tear to train wheels (unless switch diamonds are installed, but these can be unreliable). The next best design is a double crossover where a trailing and facing crossover are located as close as possible. Due to the location of the entrance to the sidings, and a curve in the track beyond the sidings points, a scissors crossover would be best suited for this location. The diagram below shows how Kippa-Ring should have had its track layout designed in BrizCommuter's opinion - red shows a removed crossover, and the light green shows where a scissors crossover should be located.
Note: Varsity Lakes also has a bizarre terminus crossover layout, with the trailing crossover closer to Robina. Though at least it seems that trains can turnback in a siding to the South of Varsity Lakes as well.