Mechanized Locomotive A.K.A. The Brass Bullet

"It is a marvel to behold if I do say so myself. One of my greatest creations, well at least this generation at least. This mechanized train system is a self-sustaining, self-maintaining mass transportation system of my invention. I call it the Mechanized Locomotive. It's powered by condensed arcane essence, another discovery of mine as well. With this invention even the most common man can see the world."
~ Beatrice, Champion of Ioun

Utility

The Brass Bullet is mostly used for transpiration of the populace. It has also been utilized for the transportation of goods that are unreachable from the sea and hard to reach by land. There are also businesses that utilize the Brass Bullet for the transportation of slaves, illicit goods, or even escort services during long travel times between destinations.

Access & Availability

The Brass Bullet is common way for people to travel across the continent. Though it's uncommon to find peasantry on the Brass Bullet it's not unheard of to go to close settlements.

Complexity

The Brass Bullet is a very complex piece of equipment. Not only is there the engine that uses the condensed arcane essence as fuel, the brass golems used for maintenance and services, and other mechanized parts to allow for the train cars to move.

Discovery

The discovery of the Brass Bullet is a conglomerate of multiple inventions of Beatrice's that have became the magnificent structure it has become today. It was by happenstance that Beatrice created the Brass Bullet due to a previous commission that she accepted to craft mechanized servitors.
At the completion of the commission Beatrice thought of how she could utilize them in her lab, and how society could benefit if the servitors were cheaper and more readily available. To her dismay it was impossible to make the servitors cheap enough to get in the hands of the common man, but she was able to start the process of the research for the Brass Bullet.