One of some 45 patents, this represents pioneering thinking at a time when railroads were contemplating communications with moving trains, before radio was invented.
As the industrial revolution evolved, it was not unusual for various inventors to be working on similar subjects, and it is not always easy to trace the actual implementation of one person's design versus another's, but clearly Wood's work was taken seriously.
One of his most noted inventions was a system for letting the engineer of a train know how close his train was to others. This reduced collisions between trains. Other patents involved electrical transmission and brake systems. Another was his Synchronous Multiplex Railway Telegraph.
Many of Woods' patents were sold to larger organizations such as General Electric, American Bell Telephone, and Westinghouse Air Brake Company.