That's an awsome find!! Thanks for sharing it!
That's one of the last of it's type to be delivered. It's full designation is DRS 6-4-660/1 NA105, road number 040-DB-405. It weighed 235,000lbs total, with an axle loading of only 39,000lbs for use on really lightweight track. It is powered by a 606NA engine, and it was one of the first export units to be delivered with the 75 volt control system. It arrived in Cassablanca in January of 1948, along with 5 other identical units. Prior to it's delivery SNCF had ordered 100 similar units for use in France in 1946-1947, one of which I know is preserved in perfect condition.
The Roto Clone equiped units mentioned are modified DRS 6-4-1500 units, and were shipped about the same time. I have no idea if any remain.
That's pretty neat!
-Mechanical Volunteer, Arizona Railway Museum