As far as I know, the pantograph on C3802 was unique.
It had two arms on the outer side of the pan, and looked like half a standard pantograph. I seem to recall that it was said that the two arms were required for the heavier pan needed by the 1500 V DC system compared to lighter equipment used on AC systems. Clearly, since single arm pantographs have since been used on Dc in NSW, this concern was unneccesary.
There should be photographs in copies of Railway Transportation Magazine, (1951-1975) now available on DVD.
I think only 3801 and 3803 were converted to trailers as 4797 and 4799.
3802 would have been 4798, 3804 would have been 4800.