The flollowing literature may be useful for your research

Certification data on this page

Marine Remanufacture Kits

Large Engines

Non-road Large Compression Ignition (NRCI) (2012 - )

On-Highway Heavy Duty - Diesel and Gasoline (2012 - )

Early Large Engine (NRCI and On-Highway Heavy Duty - Diesel and Gasoline. 2011 and Earlier)

Non-road Small Spark Ignition (SI)

Marine SI

Marine CI

Snowmobile

Locomotive

Large Spark Ignition

Non-road Evaporative Components

Ref: www.epa.gov › ... › Heavy Trucks, Buses, and Engines

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A very comprehensive database of vehicle certification data for Europe is also available on the VCA website : http://carfueldata.direct.gov.uk/search-new-or-used-cars.aspx