This means that you'll be able to search for NAICS codes directly (if that's your jam). We'll do the math; let's make better data on public procurement together.
Railroad Gates; Flasher Lights; Block Signals.
Semaphore Flag Signals.
Possible NAICS Codes
336510 – Railroad Rolling Stock Manufacturing
488210 – Support Activities for Rail Transportation
423420 – Office Equipment Merchant Wholesalers
335122 – Commercial, Industrial, and Institutional Electric Lighting Fixture Manufacturing
334516 – Analytical Laboratory Instrument Manufacturing
333318 – Other Commercial and Service Industry Machinery Manufacturing
333244 – Printing Machinery and Equipment Manufacturing
332999 – All Other Miscellaneous Fabricated Metal Product Manufacturing
332618 – Other Fabricated Wire Product Manufacturing
238290 – Other Building Equipment Contractors