If it is a vertical engine, then it cannot be horizontally
opposed. The piston in a vertical engine moves up-down while that
of a horizontal engine moves left-right. A horizontally opposed
engine have 2 sets of pistons placed directly opposite to one
another.
The correct term for the 'N' in 'N113' is transversely mounted,
vertical engine. The 'C' in 'CRB' stands for single deck rigid
bus.
