Question

Wrong Side of the Tracks from a less socially desirable part of town; the poor, unfashionable

Accepted Answer

Alex's mother was horrified when he started dating a girl from the wrong side of the tracks. In the early days of the railroads, about the middle of the 1800s, train tracks often divided a town into rich and poor sections. The better-off neighborhoods were sometimes built on the side of town where the smoke from trains didn't blow. So the "wrong side of the tracks" was a phrase that came to describe the socially and economically undesirable part of town.

Idiom	Wrong Side of the Tracks
Example	Alex's mother was horrified when he started dating a girl from the wrong side of the tracks.
Meaning	from a less socially desirable part of town; the poor, unfashionable
Origin	In the early days of the railroads, about the middle of the 1800s, train tracks often divided a town into rich and poor sections. The better-off neighborhoods were sometimes built on the side of town where the smoke from trains didn't blow. So the "wrong side of the tracks" was a phrase that came to describe the socially and economically undesirable part of town.

Side Tracks Wrong Socially Part Town Alex's Mother