Maxi-Stack® IV is a double-stack car.

Maxi-Stack® IV Car

The Maxi-Stack® IV car is the mainstay of the United States domestic double-stack car fleet because it provides the optimum balance between tare weight and capacity. It is a three-unit, articulated double-stack car that can handle containers from 20’ to 53’ long in the well and containers from 40’ to 57’ in the top position.

Maxi-Stack® IV Car technical drawing.


Length, Inside 53′-2″
Length, Over Couplers 203′-9.75″
Width, Inside 9′-10.5″
Width, Extreme 9′-10.5625″
Clearance AAR Plate H


Light Weight 129,500 lbs
Load Limit/Capacity 118,500 lbs per well
Gross Rail Load 485,000 lbs

Curve Negotiability Radius

Uncoupled 180′ horizontal
Coupled to Base Car 302′
Coupled to Like Car 306′

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