This is the 3rd batch of Aluminium Coal Hoppers to be called CH. Tullochs of Rhodes produced 100 of these hoppers from December 1969 to November 1970.
The 3 door 'Clam Shell' design was unique to this hopper, and they were numbered from 33151-33250.
The first 4 hoppers (33151-33154) had a trial new logo for the NSWR, a yellow background with a black stylised 'R' with NSW written vertically within the 'R'.
It doesn't appear that this was successful as later on another 4 hoppers (33201-33204) were chosen for a revised design, being a white background with a red 'R'.
No other hoppers in this batch had this logo applied.
On Track Models is producing 2 packs of 4 models, each pack represents each version of trial logo.
While the Railways evaluated the new trial logos on the first 4 hoppers produced, Tullochs produced another 46 hoppers (33155-33200) before the second trial logo was introduced.
Tulloch manufactured a further 46 hoppers (33205-33250) thus completing its contract with the NSWR.
None of these 92 hoppers had any logos applied other than the usual code boards.
They have been used throughout NSW on Coal Traffic.
These hoppers retained their CH code until the 4 letter re-codings of the 1980's.
On Track Models produces 3 packs of 4 models based on these wagons.