Why did Cornelius Vanderbilt sell his shipping empire?

Cornelius Vanderbilt sold his shipping empire primarily to focus on the emerging railroad industry, which he recognized as a more lucrative opportunity. By leveraging his shipping profits, he invested heavily in railroads, leading to significant growth and expansion in that sector. Additionally, the transition allowed him to consolidate his wealth and influence in transportation as the nation shifted towards rail as the dominant mode of travel and freight.