COLUMBUS, Ind. (June 7, 2004) - Cummins Inc. (NYSE:CMI) today announced a major order of ISX engines from International Truck and Engine Corporation for Heartland Express. Heartland Express Inc., a leading truckload carrier, has placed an order for 2,800 International" 9400i trucks, predominantly powered by the Cummins ISX, to replace its current fleet of trucks over the next three years.

"We are committed to providing our customers with the most reliable and durable engines, along with the lowest total operating costs," said Cummins Vice President - Sales and SupportJeff Jones. "The order from Heartland Express demonstrates the confidence that customers have in Cummins to provide the best products, along with the lowest life cycle costs."

Cummins ISX engines feature the patented and proven Cummins Variable Geometry Turbocharger (VG Turbo) by Holset that constantly adjusts airflow based on several factors, including altitude and temperature, providing improved transient response and vehicle performance. Because the VG Turbo has only one moving part in the hot exhaust stream, it is more reliable and durable than competitive turbo designs which use flexible vanes with dozens of wear points and moving parts. Cummins patented design has been proven highly effective and reliable in more than 150,000 vehicles worldwide.

Cummins ISX engine was the first heavy-duty truck engine certified and compliant to the October 2002 emissions standards. More than 52,000 Cummins heavy-duty truck engines have been put into service since October 2002. With more than 3.2 billion miles of in-service use, these engines have proven performance and reliability.

The Heartland Express order is for the Cummins ISX 435 ST, a rating which is unique to the Cummins/International partnership. ST, or SmartTorque, ratings, which provide up to 200 additional lb-ft of torque while operating in the top two gears of the truck, provide customers with improved performance and fuel economy.

Deliveries of the truck order began in May 2004 and will continue through the end of 2006.

Heartland Express Inc. (NASDAQ: HTLD) is an irregular-route truckload carrier of general commodities. The company has built a solid reputation for providing superior service to the short -to-medium-haul truckload market. Principal traffic lanes lie east of the Rocky Mountains, however, the company does provide select team service to the West Coast markets.

International Truck and Engine Corporation is the operating company of Navistar International Corporation (NYSE: NAV). The company produces International® brand commercial trucks, mid-range diesel engines and IC brand school buses, and is a private label designer and manufacturer of diesel engines for the pickup truck, van and SUV markets. With the broadest distribution network in North America, the company also provides financing for customers and dealers. Additionally, through a joint venture with Ford Motor Company, the company builds medium commercial trucks and sells truck and diesel engine service parts. Additional information is available at

Cummins Inc., a global power leader, is a corporation of complementary business units that design, manufacture, distribute and service engines and related technologies, including fuel systems, controls, air handling, filtration, emission solutions and electrical power generation systems. Headquartered in Columbus, Indiana (USA), Cummins serves its customers through more than 680 company-owned and independent distributor locations in 137 countries and territories. Cummins also provides service through a vast dealer network of more than 5,000 facilities in 197 countries. With more than 24,000 employees worldwide, Cummins reported sales of $6.3 billion in 2003. Press releases can be found by accessing the Cummins home page at