What Tier 4 field test experience does Cummins have?
• The first of our Tier 4 Interim field test engines started running in the field and earning revenue for the operator in June 2008. Tier 4 represents the most extensive development, concept installation and field test program that Cummins has ever undertaken with off-highway engines. We have been deliberate in selecting specific customer field tests to cover the widest possible spectrum of machine types and duty cycles.