Building time: 3 weeks.
This classic space train is based on the awesome Lego 6990 Futuron monorail. I always wanted it as a kid (next to my train, I loved Lego space) but never got it. The train doors can be opened by remote control. This is achieved by a pneumatic switch that is moved by a small linear actuator and an Power Functions M motor connected to a PF IR receiver. The air pressure is delivered by a pneumatic air tank which is filled by a hand pump that is located in the first cabin of the train. One air tank can open and close the doors three times.
The train is riding around in a classic space layout with, of course, also the vintage space monorail. Further more there are Blacktron II, Ice planet and Futuron classic space set for display.