Trains under review, as expected (7,5)
I believe the answer is:
rolling stock
'review as expected' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for rolling stock that I've seen before include "Railway vehicles" , "Locomotives and coaches" , "Locomotives, carriages etc" , "Railway wagons" , "Rail vehicles" .)