The Arduino Uno, seen here ... do their jobs so well on their own that I can’t imagine a case where you’d need to. We’ve published numerous articles on ways you can use an Arduino on a model railroad.

[Jeremy Cook] has had it with loose jumpers pulling out of his Uno, so he designed a case that not only secures the Arduino; it also keeps those dastardly jumper wires from pulling out at the most ...

You can even build yourself something simple based on an Arduino Uno! The build uses Panasonic’s cheap “Grid-EYE” infrared array as the thermal sensor, in this case, a model with an 8×8 ...

As long as what you're building doesn't need to be squeezed into a tight case, you can likely use an Uno board for it. Some beginner-friendly Arduino Uno projects you can get started with include ...