Answer:
There once was a man named Elijah McCoy.
Elijah's parents escaped slavery by taking the Underground Railroad to Canada.
Elijah's invention helped make trains run faster and better.
They were very happy with Elijah's invention.
If something is genuine or real, people say that it is the "real McCoy."
Some people think that the saying started with Elijah.
As the story goes, Elijah's invention was much better than the other inventions.
When people would get an oil valve, they would ask "is this the real McCoy?"
Elijah McCoy lived to invent many other things and received fifty-seven patents for different machines.
Step-by-step explanation: