DUPLO Monorail
Here is a DUPLO monorail with 2 stations and people waiting for the trains.
The First train is built when my son was 5 years old.
First train has a small wheel brick 2x4x1. The Second train is upside down version which work well without a wheel brick. The upside down version can be build with the most basic DUPLO bricks.
To have more than a straight line, we need a turning point, there i a glap on 1x1 but the train goes smooth over it.
To make a slope some DUPLO Toolo part can be used. Here have I use 3 Toolo parts and gain 1 brick heigh so to get som height you need alot of Toolo  bricks.
The Toolo bricks could be use to build a switch for monorails
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