See my videos of holding onto the back of the loco pulled train rumble.com/v54cjto-luxembourg-train-surf-in-the-west-of-the-country.html rumble.com/v54cif9-luxembourg-train-surf-heading-towards-the-north-of-the-country.html
Inside Luxembourg, transportations are fully free. Please note, ticket machine (like this one in 9:15, are for international transportations and first class, not free). Luxembourg trying to export his free system outside this border. Since 2022 it's also free for French cross-border.
The trams look like Siemens Combino trams but a very recent generation of them! Melbourne has them too but of an older model that was introduced in the early to mid 2000s! :)