Gas compressors; emissions control apparatus for natural gas exhaust, namely, emission control systems being structural parts for internal combustion engines comprised of fuel catalysts and porous materials, filters, and devices to control contaminants, including nitrous oxides, sulfur-derivatives, methane and uncombusted hydrocarbons.

Railway tenders, trailers and mobile storage containers in the nature of tanks for natural gas; combination dual-mode diesel and compressed natural gas tanks for railway trains; locomotives and railway trains; hybrid natural gas and diesel-electric locomotives and accompanying power units sold together therewith.