Allegheny Portage Railroad National Historic Site

Allegheny Portage Railroad National Historic Site is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Railroad Contractors

North American Industry Classification System (NAICS) Categories:

• Industrial Building Construction > Railroad & Subway Construction > Railroad Contractors

Standard Industry Classification (SIC) Categories:

• Heavy Construction, Nec > Railroad & Subway Construction > Railroad Contractors