Well, i originally said i wasn't going to have a painting option for the coasters in the game, but i changed my mind.
Here is a rather ugly coaster which could do with a nice coat of paint:
It's pretty simple to make things a bit more colourful. Here we see the Paint Panel, it allows the player to paint the trains, track and supports.
There are three parts of a car you can paint. The coaster in this example is the B&M Inverted coaster. The parts that can be painted are the body, seats and restraints.
When it comes to painting the track, there are also three parts which can be painted. The supports can only be given a single colour. Here is a fully painted coaster. I didn't really choose the most appealing colour scheme though.
Here we have the main interface of the game. At the bottom left is the paint options which we just looked at. Above them are the typical File and Options buttons. The main buttons we are interested in lie in the middle. Track, Lift, Launch, Wheels and Brake all do what they say on the tin. There are three options for standard track: standard, twist away and twist towards. The twist options allow you to create barrel rolls, zero-g rolls, dive loops, immelmans and turn the train around.
Launch acts slightly differently on different coasters however. Most coasters will use an LSM launch, which simply boosts the train forwards. The Intamin Accelerator Coaster, however, has to engage with the launch mechanism before launch. This means it must enter the launch track at a slow speed. The Accelerator Coaster can reach speeds of over 130mph.
There are three different types of brake in the game. The standard brake slows the train down, and powers it along at a slow speed (it's a good idea to put these before the train reenters the station, otherwise the train may fly straight through and out the other side). Block Brakes are another option, if you use these, more than one train may run on the track, but only one train may operate between any two block brakes and the station. The third type of brake is a holding brake. These hold the train still for a second before releasing, as seen on coasters such as Oblivion.
The settings button allows you to configure your coaster, such as changing the launch and lift speeds. The test button allows you to run your coaster and have control over various aspects.
The rate button allows you to run the coaster, but you will not have any control over it. You get a score at the end of the rating which can be uploaded to the online score table for that specific level.
There is also a minimap which displays the level and the coaster you are building. In this screenshot I was building on a blank level, so no terrain is displayed in the minimap. You also have the option of locking the view on the end of the coaster, so the screen automatically scrolls as you build.