AFAIK railroads are not too important early game, compared to their expense. Just build a railroad in your province with the factory for now. In my experience, in the early game, the best factories to have are steel glass and lumber, possibly paper, with cement not quite as profitable but sometimes necessary to have. The thing about your RGOs is that you want to steadily convert the workers in them to factory workers until in the late game you only have people working on important resources like iron, sulphur, coal, precious metal... The game is about the transition from agrarian to industrial society and it simulates it well; factories are a LOT more profitable than farms are in victoria
Unfortunately as switzerland you have only limited potential and your economy will be very weak in the beginning. With no colonization potential, I guess you'll just have to creep along making railroads as the money is made available, researching to get machine parts so that you can finally make some more profitable factories like clothing, luxury clothing, machine parts, and eventually steamers.
Finally, you will want to convert some POPs to capitalists. This comes later in the game as it's expensive and in any case you don't have access to the luxury furniture required for a while. I always choose "meritocracy" in "meritocracy vs aristocracy" and I BELIEVE that is what sets it to 333K capitalist people to give you a 50% industrial bonus per state. So in other words, promote about 300K capitalists, most preferably your largest pops (hopefully you will have some extra population, I am not specifically familiar with switzerland but they seem to have a decent-sized state and not broken down into multiple states thus requiring more capitalists)... anyways those are just some things I wish I knew when I started playing this game so hopefully at least something I said helps
