What railroad does Bill Gates own?

I'm curious to know, could you clarify which railroad Bill Gates owns? As an avid follower of both technology and finance, I'm intrigued by the intersection of these two industries. It's not commonly known that Bill Gates, the co-founder of Microsoft, has invested in the transportation sector, specifically railroads. So, I'm wondering if you could provide some insight into this matter. Is there a particular railroad company that he owns or has a significant stake in?