Terminal Dwell: Railroad Yard Time, Network Fluidity, and Service

Terminal dwell measures the time freight cars spend in a railroad terminal or yard before continuing through the network. Railroads commonly report it in hours.

Lower terminal dwell generally indicates that cars are spending less time stationary in yards, which can support better network fluidity and higher Freight Car Velocity.

What dwell captures

A railcar may enter a terminal to be classified, switched, assembled into another train, interchanged, inspected, or otherwise processed before departure.

Dwell captures time spent in that terminal process rather than line-haul movement between terminals.

That makes dwell different from train speed. A network can have acceptable line-haul speed but weak overall car velocity if railcars spend too long in yards.

Dwell and freight car velocity

The relationship is intuitive:

1More Terminal Dwell -> More Stationary Time -> Lower Potential Car Velocity

The inverse is also generally true: reducing dwell can raise average daily miles per car even if train speed does not change much.

Union Pacific explicitly identifies terminal dwell and train speed as the two key drivers of freight car velocity.

Lower dwell is usually favorable, but context matters

Lower dwell is generally desirable because it can reduce congestion and improve equipment turns. But an isolated decline in dwell is not automatically evidence of better economics.

Dwell can change because of:

• traffic mix;
• terminal closures or network redesign;
• lower volumes;
• train-length changes;
• operating-plan changes;
• weather;
• labor availability;
• interchange conditions; and
• measurement methodology.

A railroad that handles less complex traffic may report lower dwell without necessarily improving underlying execution.

Dwell versus service quality

Terminal dwell is a network input, not the same as customer service.

A shipment can move quickly through terminals but still miss its promised arrival because of line-haul delays, missed connections, origin performance, destination congestion, or schedule design.

Investors should therefore compare dwell with:

• freight car velocity;
• average train speed;
• on-time arrivals;
• trip-plan performance;
• customer service indices; and
• volume trends.

Railroad methodology can differ

CSX notes that its methodology for certain operating statistics differs from the methodology used for Surface Transportation Board reporting. That warning is important for dwell as well as other operating measures.

Investors should avoid assuming that two railroads' reported dwell figures are perfectly comparable unless the definitions, included terminals, event timing, and averaging conventions are aligned.

Why dwell can affect capital efficiency

Railcars sitting in terminals are assets and customer freight that are not progressing toward destination.

Persistently high dwell can contribute to:

• slower car turns;
• higher car requirements;
• yard congestion;
• additional locomotive or crew complexity;
• lower network capacity; and
• weaker shipment consistency.

Reducing dwell can therefore create capacity without adding equivalent physical infrastructure, though the economic benefit depends on whether the improvement is sustainable and supports actual customer demand.

Real-world filing context

Union Pacific reports average terminal dwell alongside train speed and freight car velocity and described lower dwell as an important contributor to improved network fluidity in 2025. CSX also reports dwell among its operating statistics while cautioning that its methodology differs from the STB methodology.

Sources:

• Union Pacific 2025 Form 10-K
• Union Pacific June 2026 Form 10-Q
• CSX 2025 Form 10-K

Bottom line

Terminal dwell measures railcar time spent in terminals, not line-haul speed or customer service directly. Lower dwell can support faster car velocity, better asset utilization, and more network capacity, but investors should preserve methodology, traffic mix, and service context before comparing railroads.

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