You can experience Brainy's World in either Flash or HTML. In case you're not familiar with that web jargon, Flash requires a free player (which you may already have installed), works best with a broadband connection, and allows you to enjoy animation. If you don't have Flash installed and don't want to download it, or if you are using a dial-up connection, the HTML site will work for you. Either way, you'll get lots of helpful railroad safety information.