LOL now i finally know why you keep saing there were C151As on
NSL.
The EDS is displaying the route number not the trainset.
Trainset number can be found at the start and end of each carriage
in the interior of the train.
Hope this helps. 
Nope, the C151As were seen from inside one. I didn't know
because sometimes the number outside and inside are the same. And
concidentally, it happens to me...