I know of 3 NG engines under going restoration to operational condition:
Nevada State RR Museum
Carson City, Nv.
Carson & Tahoe Lumber & Fluming Co. #1
1875 36" gauge 8-20-D
"Glenbrook"
[www.nsrm-friends.org]
Nevada County Narrow Gauge Railroad & Transportation Museum
Nevada City, Ca.
Nevada County Narrow Gauge #5
(Orig. Carson & Tahoe Lumber & Fluming Co. #2, "Tahoe")
1875 36" gauge 8-20-D
[www.oro.net]
Carson & Colorado Railway Co.
Independence, Ca.
Southern Pacific Narrow Gauge #18
1911 36" gauge 10-26-D
[carsoncolorado_rwy.homestead.com]