Introduction
Ensuring the safety and timely transportation of children is the primary goal of school transportation systems. Cummins prioritizes providing engines that operate cleanly, efficiently, and reliably with minimal maintenance.

Emission Standards and Engine Options
With stricter 2007 emissions standards, Cummins offers diesel engines that are low-maintenance and fuel-efficient, significantly reducing particulate matter emissions. Cummins also provides closed-loop lean-burn natural gas and liquid propane engines with low NOx and PM emissions.

Diesel Engines: ISB and ISC
The ISB (200-325 hp) and ISC (240-330 hp) engines feature a 24-valve design and High Pressure Common Rail fuel system for optimal performance. Cummins ensures complete in-house design and manufacturing control, including the proprietary Cummins Particulate Filter, integrated for optimal performance and longevity.

ISB Engine Features
The 6.7-liter ISB engine offers increased displacement for enhanced power and performance. It includes a Variable Geometry Turbocharger for precise boost control and an automatic aftertreatment system, maintaining quiet operation.

ISC Engine Features
The ISC engine integrates a High Pressure Common Rail fuel injection system, VG Turbo, and Cummins Particulate Filter, providing cleaner operation and improved efficiency. It also features an integrated exhaust brake and simple maintenance requirements.

Alternative Fuel Engines
Cummins Westport offers B Gas Plus, B LPG Plus, and ISL G engines, certified to meet EPA and CARB emissions standards. These engines provide reliable performance, low emissions, and high efficiency.

Warranty and Support
Cummins engines come with a standard warranty covering 100,000 miles or 5 years, with major components covered for up to 300,000 miles. Extended coverage plans are available. Cummins provides extensive support through a service network, customer assistance center, and online resources.

Service and Maintenance
Cummins engines are designed for easy service and maintenance, compatible with Cummins INTELECT™ engine software. Tools like INSITE™, INFORM™, and INTERCEPT™ assist in diagnostics, data management, and parts identification.

Engine Ratings
The document provides detailed engine ratings for ISB, ISC, B Gas Plus, B LPG Plus, and ISL G engines, specifying horsepower, torque, and RPM.

Conclusion
Cummins continues to innovate and improve its products, offering a range of engine options that meet stringent emissions standards while ensuring reliability and efficiency for school bus fleets.