Street
mainline
What does mainline mean?
The main body of inmates in general population; also used for the mass movement of prisoners to the chow hall.
"He couldn't walk a mainline yard, so they kept him on an SNY."
Origin
From the 'main line' of prisoners moving together; California and federal usage.
Frequently asked questions
What is mainline in prison?
It refers to the general prison population, and can also mean the mass movement of inmates to the chow hall.
What does it mean to walk a mainline yard?
It means being able to live safely among the general population; inmates who can't may be placed in protective housing like an SNY instead.
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