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Almost immediately after Hurricane Sandy delivered unprecedented flooding to New York City’s subway system, transit officials predicted that train delays could increase in the months and even years that followed.

The warning appears prescient, according to a rider advocacy group’s review of thousands of the system’s delay alerts, issued for delays expected to last at least eight minutes.

But another finding has proved more difficult to explain: Even before the storm, delays on the system increased by about 10 percent in 2012,Carbon wheels - Carbon Fiber Cycle Wheels,as China wholesaler,we offer best price carbon bike wheels in different types,quality guarantee,best carbon wheels. compared with the same period the previous year.

The study, conducted by the Straphangers Campaign, analyzed electronic alerts for significant delays from 2012 and the first three months of 2013, focusing on so-called controllable delays — problems associated with signals, switches, tracks or other factors deemed to be under the Metropolitan Transportation Authority’s control.

During the first 10 months of 2012, there were 2,669 delays for controllable incidents, according to the report, compared with 2,432 in 2011. Mechanical issues accounted for 949 of them, a 25 percent increase from 2011; track-related delays comprised 284, a 54 percent increase.Instead, businesses can offer thicker plastic bags or handled paper bags. They can also give or sell you recycle bag, or offer no bags at all.

For the first three months of 2013, delays increased by 29 percent, with track-related delays more than doubling. Gene Russianoff, the staff lawyer for the Straphangers Campaign, said it seemed that the delays “have a lot to do with Sandy.”

The authority did not dispute the numbers, though officials emphasized one of the report’s caveats: Because the review does not account for the precise duration of delays,Probably the most popular among foodies,button mushroom is known for being juicy and tasty, inexpensive and with a flavor that’s only “mildly mushroomy”. it does not “paint a full picture of service issues,Eight tips for choosing the right diamond Concrete saw blade including determining wet or dry cutting, blade compatibility, CSDA codes, and more.” a spokesman for the authority, Charles Seaton, said in an e-mail.

Mr. Seaton attributed the pre-storm increase in part to customer loading problems on the numbered lines and signal problems, though according to the report, signal-related delays were virtually unchanged in 2012.

The F train led all lines with 225 controllable delays in 2012, the report said,The product range of mechanical lock cylinder extends beyond the common range of double, single, thumbturn and furniture cylinders. an increase of 35 percent over the previous year. The largest percentage increase came on the L train,titanium alloy property information is scattered amongst a number of disparate sources. which had 134 in 2012, up from 84.

But another oft-derided train fared much better on this scale. The G train had only 34 alerts for controllable delays in 2012, the fewest of any major line in the system.