New York's subway delays and disruptions are becoming more regular - here's why

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New York subway delays have increased this year after decades of underinvestment in the aging system.

New York's subway system has been under closer scrutiny as disruptions pile up during what many are calling the "summer of hell."

It's hard to go a day without seeing a new complaint about the ailing system on social media. But the frequency of complaints are not just the product of easy access to Twitter: Delays have skyrocketed to 70,000 per month from 28,000 per month in 2012, according to the New York Times.

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There are quite a few factors causing the decline in service - scroll down for a closer look: