It's important to note:
* Prior to Trevithick's work, others had experimented with steam-powered vehicles, but they were not practical or efficient.
* Trevithick's locomotive, though crude by today's standards, demonstrated the potential of steam power for transportation.
* George Stephenson, a few years later, developed a more practical and successful locomotive design, which ultimately revolutionized transportation.
So, while Trevithick isn't the only name in the history of the steam locomotive, his invention marked a significant milestone in its development.