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The Transportation Services Index (TSI) clocked in at 111.8 in July, inching up 0.1 percent from June's level and matching the incremental increase registered from May to June, according to the U.S. Department of Transportation's Bureau of Transportation Statistics (BTS). On a year-over-year basis, the TSI rose 2 percent.

The Freight TSI also increased 0.1 percent from June's mark, reaching 109.6. The index — which measures the output of for-hire rail, trucking, inland waterway, pipeline and air-freight companies — rose 1.9 percent compared with July 2011.

"The Freight TSI in July continued a pattern of little change since January. This appears to reflect the rate of growth in the general economy," BTS officials said in a prepared statement. "Freight shipments in July were at the sixth-highest monthly level since the early recession month of July 2008, despite the 3.8 percent decline from its peak in December 2011 (114.0), which was the highest level in the 22-year history of the Freight TSI series."

Meanwhile, July's Passenger TSI of 117.7 made it a trifecta by also increasing 0.1 percent from June's level. The seasonally adjusted index, which reflects data from air, local transit and intercity rail providers, climbed 2.3 percent on a year-over-year basis.