NDNF:

I believe the NDNF is also a former BD/NOAF wagon, but with the full length being open (ie no end decks). Note most have partially corrugated sides and pressed ends, however NDNF 2637 N has completely flat side panels, and NDNF 2536 E at the time of the picture has one pressed end and one corrugated end.

More spoil wagons to come …