6991 Monorail Transport Base
6991 Box

Set NO.





FlagUS $178.00





6991 Monorail Transport Base is a Unitron set released in 1994. It contains a Monorail track with a large, one-way station. Two terminals and a train are also included, as well as wheeled ground vehicle and four minifigures, three of them being Unitron Astronauts and one being a Spyrius Droid.


The Monorail Transport Base was the last Unitron set released by The LEGO Group, and also the largest. It is the only monorail in which the modules can be removed and placed on other Unitron sets. There are also accessory monorail tracks which can be added to make larger routes. The set comes with multiple baseplates, allowing the set to serve as a connection between two bases. The two bases each are built differently. The first one, where the monorail ends/begins, has the monorail track placed high-up and has a raised level below it. On its base is another beginning/end to the track, and, interestingly, there is a Spyrius Droid on it. The second "base" is a waystation with a special track piece that allows to stop the train or change its direction, and consists of a larger building on a raised baseplate.

The pieces mainly come in one of a few colors. The monorail tracks are light grey, along with a few other pieces. The transparent pieces are mostly transparent light green and transparent light blue. The remaining pieces are mostly black and white. An anomaly in the overall color of the set is the Spyrius Droid, being red with a clear transparent helmet.

The two vehicles in the set are both in the style of the theme. One vehicle is a large-wheeled land vehicle. It has no weaponry, but has a large enough space on top of it to allow it to transport small to medium space vehicles. The second vehicle, the monorail itself, is much longer than the land vehicle. It also features no weaponry, but travels along a long monorail track. It can transport people and weapons. The monorail is motorized and contains a light and sound function.


Trivia Edit

  • This was the largest Unitron set, as well as the only set of this subtheme that was released outside of the USA. It is also one of three monorail sets, the others being from Town and Futuron.