That is a pic of a consolidation that was used as a road engine. I would doubt that all of the 2-8-0 class was converted into switchers, if I'm understanding you correctly. Now they may have been fitted with different pilots or this is of a class different from the one you're thinking of.
Many RR's had different classes of the same wheel arrangements. Ex. SRR had 2-8-0's in G, H, I, J, & K classes, as well as several subclasses of each.
The CN section there says that the N4 (2515-2686) were built between 1906 and 1911 and last retired in 1961.