8923 is an 1989 Orion V, one of the longest 89 fleet before retiring. The reason it had the longest after the remainder of 89 and 90 Orion V is because it had an engine replaced.
Seen here filming at Clarkson GO stn in the summer of 2008, shortly after I've taken some shots, it has retired.
Powered by Cummins L10 with Voith D863 3-speed