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Few standard approval tests exist for fire extinguishing systems for commercial vehicles, such as transit vehicles, coaches etc. Therefore, a representative test article has been constructed to evaluate the fire extinguishing performance of current in-house fire protection systems. This data will then be used as a benchmark against which the performance of future fire extinguishing systems can be judged. The test article is a fire-hardened simulation of a rear-engine transit bus. Several fire locations are used, in two configurations: “small” and “large”. The former encompasses diesel fuel spray fires and small, obscured diesel pool fires some containing additional wood chips; the latter represents a more developed diesel fuel spray and larger diesel pool fires. Tests have also been run simulating the ignition of a diesel fuel spray impinging on a hot turbocharger. Parameters pertaining to restrike have also been investigated.