336510  Railroad Rolling Stock Manufacturing 

This U.S. industry comprises establishments primarily engaged in one or more
of the following: (1) manufacturing and/or rebuilding locomotives,
locomotive frames and parts; (2) manufacturing railroad, street, and
rapid transit cars and car equipment for operation on rails for freight
and passenger service; and (3) manufacturing rail layers, ballast
distributors, rail tamping equipment and other railway track
maintenance equipment.

The data published with NAICS code 336510 include the following
SIC industries:

3531 Construction machinery (pt)                                               
3743 Railroad equipment (pt)