What type of engines do school buses have under the hood?

School buses are a fixture on American streets, but have you ever wondered what engines power these useful vehicles? Here's ...
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IC Bus begins deliveries of CE series with Cummins ISB engines

IC Bus has started customer shipments of its first CE Series school buses with the Cummins ISB 6.7-liter engine. The first units were released this week from the company’s Tulsa, Okla., assembly plant ...