Rx207 and Rx224 in the 1970's (more info in the description) 

It is mainly due to the conversion of the mainline through the Adelaide Hills from Broad to Standard Gauge which took place in the mid 1990's. Also, the line through the Barossa Valley was also converted to Standard Gauge.

@@railmediaproductions3677 I'm still confused

​@@Cullerin112Because they like bikes.

@@Cullerin112 SteamRanger’s Victor Harbor broad gauge line was connected to the broad gauge Adelaide Metro and regional SA network via the formerly broad gauge Adelaide - Melbourne line. The Adelaide - Melbourne line was being converted to standard gauge - the broad gauge trains cannot travel on standard gauge because the width between the wheels of a broad gauge train is wider than the width between the rails on a standard gauge track. Steamranger made the decision to transfer everything from Dry Creek, on the Adelaide Metro network, to a new depot at Mount Barker as well as an existing depot at Goolwa, both on the Victor Harbor line, so they were isolated to that one line. It was probably a good choice because by 2014, there were no more SA regional broad gauge lines connecting from Adelaide open. There was still one broad gauge heritage operation connecting to the Adelaide network, the National Railway Museum, sometimes operating redhen railcars until 2015. My understanding is that they were preparing for a weekend of runs in 2016 as they had been in 2013-2015, but they needed additional work done to be accredited that year for the Adelaide Metro network and it was too costly for the National Railway Museum, so they never ran on the Adelaide Metro network again. The requirements for operating on the NRM track is not as strict so they still do that today. SG operations on the ARTC network happen but very, very irregularly. The last proper tour with passengers was a railmotor tour from NSW a couple years ago, but I have read online that the railmotors had to travel at a restricted speed up to flashing lights/gates crossings, it seems like ARTC doubted whether NSW railmotors could activate SA crossings. This fact I am a bit unsure of but I also read that ARTC wants the railmotor operator to do test trips without passengers in SA and that would be too expensive since no passenger tickets would be funding the trip. Unless an interstate operator plans an SG tour into SA, our best bet for a mainline operator at the moment is ALARC which has run a few transfers and test trains in the past few years, but I find them to be quite a mysterious operation so far, information is very limited on them compared to most other operators.

😂