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As the Dow Jones Industrial Average races past 22,000, it is leaving its older brother in the dust.

The Dow Jones Transportation Average, the oldest stock index still in use, hit a record-high close of 9,742.76 on July 14 before taking a plunge that has continued through this week. The average fell 6% between July 14 and its close Aug. 1. 

Meanwhile, the industrial average rose about 1.5% in the same period. A divergence in the transportation and industrial indices, if it persists, can signal a potential pullback in the market.

According to analysts at Wolfe Research, the selloff in transportation could be caused by declining expectations for freight tonnage in the second half, driven by coal and grain slippage as well as falling auto sales.

The analysts wrote that "pretty much everyone faces tougher volume" in the second half, with many firms in the sector offering lowered guidance for the months ahead despite the positive start to the year.

Rail, in particular, has suffered from lowered guidance.

Despite reporting an earnings beat for the second quarter, shares of Jacksonville, Fla.-based railroad company CSX Corp. (CSX) - Get CSX Corporation Report fell more than 5% July 19 as the company predicted an unfavorable second half for auto production and domestic coal. For July as a whole, the stock fell almost 10%.

Another rail company, Norfolk Southern Corporation (NSC) - Get Norfolk Southern Corporation Report fell more than 2% July 26 after the company reported second quarter sales that matched expectations, even as profits were up 23% compared to the same period the year before. The company projected moderated volume growth for coal and merchandise in the second half, with coal exports set to slow and pipeline growth expected to cut into some of the company's business. The stock was down more than 8% in July.

Omaha, Neb.-based rail transporter Union Pacific Corporation (UNP) - Get Union Pacific Corporation Report is also hurting after projecting flat volume for the third quarter. The stock fell 1.58% after its second quarter earnings release July 20 and was down more than 6% for July.

While coal exports were strong in the second quarter, rail companies will likely continue to face headwinds in the commodity in the future. The commodity has been bolstered by limits on coal mining in China but faces long term down trends.

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"To top it all off, these rails all benefited from a resurgence in coal, including export coal, because of competitive advantages," TheStreet's founder and Action Alerts PLUS portfolio manager Jim Cramer wrote today. "But I think those could be going away, and let's never forget that while the president favors coal, that doesn't mean the utilities do," he wrote.

Transport's recent woes extend beyond rail companies.

Greeneville, Tenn.-based Forward Air Corporation FWRD, an air freight logistics company, as well as Oak Brook, Ill.-based trucking firm Hub Group, Inc. HUBG also lowered their guidance for the second half.

Forward Air dropped their third quarter guidance 3% below consensus estimates in their second quarter earnings report, sending the stock down 5% July 27 to $50.75 from $53.70. The same day, Hub Group lowered its second half guidance 9% below consensus, with the stock falling almost 15% to $33.85 from $39.80 on the report, the largest drop for the company in more than five years.

Todd Fowler, equity research analyst at KeyBanc Capital Markets, said that the trucking sector was cursed by high expectations heading into earnings season thanks to a trucking market that's as tight as it's been since 2014.

"Investors are getting a little bit skittish that the environment going into [the second quarter] won't persist going forward," he said. Fowler noted that some trucking logistics companies, such as Thomasville, N.C.-based Old Dominion Freight Line, Inc. (ODFL) - Get Old Dominion Freight Line, Inc. Report had some irregular shipping in July because the fourth of July holiday fell mid-week, a temporary shock to transporters, but that it was a stock that he would "circle back to" in the second half. 

Airlines have also taken a beating, with Atlanta-based Delta (DAL) - Get Delta Air Lines, Inc. Report down more than almost 9% in July to $49.36 July 31, Dallas-based Southwest Airlines Co (LUV) - Get Southwest Airlines Co. Report down 10% to $55.51, and Chicago-based United Continental Holdings Inc (UAL) - Get United Airlines Holdings, Inc. Report down almost 10% to $67.68.

Cramer called the stocks' performance "pathetic," saying better returns are unlikely over the next few quarters.

"Just like the old days, there is now too much competition, except this time it's from overseas," Cramer wrote. "No-frills carriers are just plain putting the hurt on any carrier with a good international business."

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