I am hoping someone can fill me in on something:).

I have two brothers that appear in a 1927 New Kensington City Directory but they are listed in the BOTH the Glassmere & Creigton section. In Creighton they are both working for a brick company & in Glassmere they are laborers for a private individual with the letters WNK after it. Does WNK mean weekends? Any advise would be great. Dawn