Why wernt more class leaders preserved? They are a obviously a special member of the class, alot more so than some others that were preserved. I would love to ride behind 3601 or 2701 or even 4301...
Could be for at least one of many reasons. The class leader may have been seriously damaged in an accident like Y101 was in Victoria, or you could have the example of B60 that was rebuilt into an A. Then there's the possibility that said class leader may be 'too far gone' to be worth restoring when there's another class member in relatively good condition that would better suit the preservationists involved, due to requiring less time and money to be spent on it's restoration.
Alternatively, the class leader might still be in revenue earning use and not available for preservation where others of the class are- S303, 308, 310 and 313 are preserved in varying conditions and S300 is still in revenue earning service with S311 in South Aus, after being purchased by WCR and passing on to CFCLA.
Also, what achievements did other members of a class achieve? B60 was the first B in service, however B62 was the first loco in Australia to travel 1,000,000 miles in traffic, and both got rebuilt to A's.