Three Lego trains load and unload at a huge Lego coal terminal. Everything is automated by Arduino.

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The trains can stop at two silos to load coal into their wagons. Next, they are parked at the train yard. When the unload facility is available, a train will be unloaded.

The unloading part is the most complicated part of the structure: after arrival of the Lego train, pneumatic cilinders will push a conductor to the bottom of the wagons, where also a conductor is located. These conductors drive power which open a hatch in the bottom of the Lego coal wagon. The coal drop on a conveyor belt and is transported with other conveyor belts and an excavator to the silos.

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Like this kind of stuff? Check out some of my most awesome projects:
Huge layout with 9 running trains:    • Lego train layout 3.0: HUGE Lego setu...  
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   • Lego train controlled by Arduino set ...  
25.000 Brick Lego train station:    • Huge Lego train station MOC of 25000 ...  
Automated Lego train level crossing with the Terminator:    • Lego train level crossing 10128 autom...  
Random controlled Lego trains:    • Even bigger Lego 9 volt train dream l...  
Automated Lego train rail crossing:    • Lego train rail crossing fully automa...  

Check out the playlist of my best Lego videos so far:
   • My best Lego videos so far!  

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The AlmightyArjen Youtube channel is about Lego train related videos. I sometimes automate Lego trains, or make a stop motion video or I just setup a huge Lego train layout in the living room. Do you have (reasonable) video suggestions? Please let me know!