CHICAGO (WLS) -- It could be a challenging weekend for CTA customers with some service in the Loop coming to a standstill.

The CTA says trains are supposed to be running normally by Monday morning, but commuters are still going to have to make it through this weekend's work.

The CTA says the Brown, Green, Orange and Pink lines will be out of services at all elevated Loop stations to replace critical track switching equipment at Tower 18.

That's at Wells and Lake and is considered one of the busiest sections of track in the entire CTA system.

The CTA says line closures are expected to go into effect at 4 a.m. Saturday morning.

Red and Blue Lines are not affected and neither is any line outside the Loop.

But here's the thing: driving might also be a headache for normal CTA riders beca

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