In 1974, the nationwide strike by all the employees of the Railways was led by which of the following leaders?

The correct option is George Fernandes.

In 1974, India witnessed one of the largest industrial actions in its history—the nationwide railway strike. This massive strike, which lasted for 20 days in May 1974, involved more than 1.7 million employees of the Indian Railways, bringing the country's public transport system to a complete halt.

The strike was organized and led by George Fernandes, who was the President of the All India Railwaymen's Federation (AIRF) at the time. Under his leadership, the railway workers demanded better working conditions, a three-tier pay scale, and bonus payments equivalent to those given in other public sector undertakings.

Therefore, George Fernandes is the leader who led the historic 1974 railway strike.