Where Did We Get the Phrase "Make the Grade?"

Part 1 of a 5-part series on the origin of popular phrases

When you succeed or measure up, we often say you "make the grade."

Engineers who built the railroads that crisscross the US originated the phrase in the 19th century.

When constructing routes through mountainous areas, they had to be sure to design gradients locomotives could handle.

Otherwise, the trains couldn't "make the grade."