Philadelphia Toboggan Company, or PTC for short, was a company that made roller coasters and other amusement park rides. It was like a big factory where people would design, build and put together roller coasters that people could ride for fun.
Imagine you like to play with toy cars, and your dad makes a toy car factory in your backyard. The factory has everything you need to make all kinds of toy cars - parts, tools, even an assembly line! You can come up with your own designs and use the factory to make your cars, and everyone in the neighborhood would want to come and play with them.
PTC was like that, but for really big rides that people could ride on at amusement parks. Roller coasters are really popular, and PTC made some famous ones that lots of people traveled all over to ride. It made them from wood and steel, and they were really big and fast!
Even though PTC isn't around anymore, there are still lots of roller coasters and other rides that are made by other companies that are inspired by PTC's designs. So next time you're at an amusement park and ride a roller coaster, you can remember that PTC was one of the companies that helped make it possible!