1910 photo of the National Silk Drying Company, located next to the Lehigh Canal at today's Canal Park. The railroad in the photo is the Central Railroad of New Jersey Terminal line, crossing over Lock 40 on the Canal. It was known as the "Dye House Lock", as it rejoined the CNJ main line just outside of the large railroad yard it established in Allentown. Later known as the Allentown Converting Company, the plant dyed and finished various silk and textile products made by companies in Allentown and the surrounding area until the late 1970s. The former dye house is now occupied by HAB Industries, a large textile finishing company.