How do you make rollercoasters go underground in roller coaster tycoon?

it's like what the other user said! however, if it is too hard to build underground, try building around water and add fountains, flowers, and a rail way to make your park look beautiful. To rephrase the other user's answer, simply take the shovel and dig for enough space. Then, take the wood that you see...click on paths: you know where they help you choose where to put your paths and what style you want them. Click on the wooding sides, not the boardwalks, and add them to your open space halfway. put ur rollercoaster in between and finish by putting the rest on to cover it up. If you don't want to show the wood, cover it up with ground by using your land elevation shovel and elevate the land. Finally, choose your type of grass and then you are pretty much done. I have never tried to build an underground rollercoaster before, but if you think about it hard enough, that is mostly how you do it. If you want further referance, read the little booklet inside the cd case. Good luck!  more