railway history

["john" <jellison@odyssey.apana.org.au>]

Can any N.S.W. Rail-fan  help me with the following?
I am interested in obtaining Technical Specs/pictures ofN.S.W.G.R.D57/58 
" Mountain "class Locos. 
When were they withdrawn from service and have any been preserved?
Also, any info on the Valley Heights N.S.W. Loco Depot and Roundhouse.
When did this Depot close and what engines were on roster during the last
days of steam?
 Any info would be appreciated if E-Mailed  to
jellison@odyssey.apana.org.au
 Thanks 
 John