The Hunter Valley Steamfest is held in April in Maitland. Hunter Valley Steamfest means steam trains, diesel trains, miniature trains, tin hares, railway lines, tiger moths, stationary engines, steam rollers, food, photography, stalls, street entertainment.
If you like the smell of coal burning & the warm clanking monsters, the next event on at 12 & 13 April 2014.
Junee has a great museum with a still functioning turntable.
The Lithgow Mine & Railway Museum is also worth a look if travelling from Sydney or nearby.