The Transportation Slowdown: An Example Of The Benefits Of Monitoring High Frequency Indicators

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New Deal Democrat


  • "Dow Theory" posits that transportation and production should move in sync.
  • Two important elements of transportation are rail and trucking.
  • While the monthly reports are only now beginning to show a slowdown, weekly rail indicators began to show a change in trend over two months ago.


It has long been thought that transportation and production should move in tandem. After all, everything that is produced, and only that which is produced, must be moved to its ultimate market. In fact, that's the venerable "Dow Theory" in a nutshell.

Further, the two forms of land transportation, rail and trucking, compete with one another, but generally move in tandem.

The Transportation Slowdown

The American Association of Railroads publishes carload volumes weekly, and that statistic is part of my "Weekly Indicators" column. In that column, beginning on October 6, I noticed that a possible shift in trend. Specifically, that week I noted a slowdown in carloads to +0.5% YoY.

The next week, on October 13, noting that total traffic was only up +1.2%, I downgraded rail traffic from an economic "positive" to "neutral."

Two weeks later, on October 27, I wrote that "tariffs [were] killing rail," YoY growth in which had slowed to only +0.5%.

Traffic varied between mixed and positive in the ensuing weeks. For the last several weeks, including December 15, I summarized the condition as follows:

"After some weakness in January and February this year, rail had been positive ever since - until about two months ago. Since then, except for one week last month, it has weakened nearly precipitously, probably due to tariffs. For three of the last four weeks, including this week, it has been negative or, as in this week, neutral."

Here's the graph of YoY changes in rail volumes (calculated weekly):

By contrast, there are no weekly updates for trucking traffic. There are two monthly reports: the Cass Freight Index and the American Trucking Association update.

Last week, the Cass Freight Index was updated for November, and showed almost no growth at all - only +0.6% - YoY:

Meanwhile, as of today, the last ATA trucking report covered October, showing continued growth as of then. The November report isn't expected for at least one more week.

The point of this article isn't to slam either of the trucking industry reports. They are good confirmatory metrics for land transportation. But the simple fact is the YoY slowdown first began to show up in a weekly rail report over two months ago. One monthly trucking report finally caught it last week. The other hasn't even been updated yet.

This has broader ramifications. Here's a graph from the Cass report, showing how truck transportation correlates well with GDP growth:


Readers of my "Weekly Indicators" columns got a two+ months' heads-up about the transportation slowdown, which, as the above graph suggests, is a harbinger for a significant slowdown in Q4 GDP.

This article was written by

New Deal Democrat profile picture
New Deal democrat As a professional who started an individual investor for almost 30 yeas ago, I quickly focused on economic cycles and the order in which they typically proceed. I have been writing about the economy for nearly 15 of those years, developing several alternate systems that include mid-cycle, long leading, short leading, coincident, lagging and long lagging indicators. I also focus particularly on their effects on average working and middle class Americans.

Disclosure: I/we have no positions in any stocks mentioned, and no plans to initiate any positions within the next 72 hours. I wrote this article myself, and it expresses my own opinions. I am not receiving compensation for it (other than from Seeking Alpha). I have no business relationship with any company whose stock is mentioned in this article.

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