I'm bringing back Traincarts today.
For those of you who don't know, Traincarts is a plugin which allows not only for you to join carts together to create a train but also enables numerous "minecart mania"-esque capabilities.
It also has some new functionality such as being able to build loops/upside-down cart tracks and hang-rails made from iron fence!
You can find out all about the plugin's functionality at their wiki page. Some of the functions overlap with Craftbook, so if you do find anything not working properly please let me know and I'll look at fixing any incompatibility issues.