Why did Granville Woods invent the third rail?

Granville Woods invented the third rail to provide a more efficient and reliable means of delivering electricity to trains. By using a dedicated rail for electrical power, he aimed to improve the safety and performance of electric rail systems, allowing for smoother operation and reducing the risk of electrical hazards associated with overhead lines. His innovation played a crucial role in the development of urban transit systems, enhancing the feasibility of electric trains in metropolitan areas.