What is the steepest incline plane in the world?

The steepest incline plane in the world is the Nanjing Yangtze River Bridge in China, which features a railway line with a gradient of 38 degrees. However, the steepest railway incline is often cited as the Gelmerbahn in Switzerland, which has a maximum gradient of 106%. These inclines are used for different purposes, with the Gelmerbahn primarily serving tourists and the Nanjing Bridge facilitating transportation.