Locomotive and transit system efficiency and emissions improvements

A system for processing generator and engine exhaust comprising:

• a prime engine connected to a prime engine exhaust stack that receives prime engine exhaust;
• a mixing duct section connected to the prime engine exhaust stack;
• a generator connected to an generator exhaust pipe that receives generator exhaust, wherein the generator exhaust pipe is connected to the mixing duct section;
• a single urea injector that injects urea into the generator exhaust pipe upstream of the mixing duct section;
• a particulate filter installed in the generator exhaust pipe upstream of the single urea injector;
• and
• a selective catalytic reduction (SCR) unit;
• wherein the generator exhaust and prime engine exhaust merge in the mixing duct section to form a merged exhaust;
• wherein the SCR unit receives the merged exhaust;
• and
• wherein the single urea injector is upstream of the mixing duct section at a distance of more than three effective diameters of the generator exhaust pipe.

A method of processing exhaust comprising:

• providing a prime engine connected to a prime engine exhaust stack that receives prime engine exhaust;
• providing a generator connected to an generator exhaust pipe that receives generator exhaust, wherein the generator exhaust pipe is connected to the prime engine exhaust stack;
• providing a single urea injector that injects urea into the generator exhaust pipe;
• merging the HEP generator exhaust and the prime engine exhaust;
• providing a selective catalytic reduction (SCR) system that receives the merged exhaust;
• and
• wherein the single urea injector is upstream of the mixing duct section at a distance of more than three effective diameters of the generator exhaust pipe.