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The U.S. economy showed moderate expansion in the past two months, as manufacturing, hiring and retail sales showed signs of strength, though several areas cited concerns about finding qualified truck drivers, the Federal Reserve said Wednesday.

The U.S. economy expanded at a “modest to moderate pace” in January and early February as factories boosted production, while transportation service showed mixed results, the Federal Reserve said Wednesday.

Economic activity expanded at a “modest to moderate pace” in late November and December as holiday retail sales showed “significant gains” from a year ago, the Federal Reserve said Wednesday.

Economic activity rose at a “slow to moderate pace” in October and November while freight volumes were mixed, the Federal Reserve said Wednesday.

The Federal Reserve said Wednesday that the U.S. economy grew at a slower pace in more areas of the country in the six weeks through mid-July, while trucking and transportation services showed mixed activity.

U.S. economic activity continued to “expand moderately” between mid-November and early January, but demand for transportation services was mixed, the Federal Reserve said.

Freight transportation activity increased in June and July, with volume gains in several regions, the Federal Reserve said Wednesday.