Alco Dunkirk questions (Updated)

What railroads switched this plant? NYC? NKP? Erie?

When was the original Works torn down? In the attached map (1954), the section marked A is where Brooks was. They owned sections B & C too (which was empty way back). By 1951, the A buildings are gone and photos of Alco in Dunkirk show the sections B&C only.

Fast-forward to today and there are buildings back in section A. Section B still has a building and C is bulldozed.

Thanks.

Brooks Locomotive Works (later acquired by Alco) was on the Erie. I don't know if the NKP or NYC also had access to the plant.

The DAV&P(later NYC Valley Branch) might have had a switch into the Alco plant. Erie definitely did. Plant was built by Horatio Brooks who was the engineer on the first Erie train to Dunkirk in 1851. NKP was not adjacent to Brooks Works.