Here are entered general works on railroad engineering, including surveying, construction, maintenance and repair, operation, etc. treated collectively.
Here are entered works on the planning, design, construction, and operation of works of various kinds for the purpose of modifying natural river conditions to better serve human needs.
--specific kinds of structures, e.g. Bridges; Buildings; specific structural forms, e.g. Girders; Plates (Engineering); and specific systems of construction, e.g. Building, Iron and steel; Concrete construction