Questions regarding DRS Class 88, ROG Class 93 locomotive diesel engines.

[yh00157]

hello. I am a railroad fanatic living in Korea.

While studying mechanics in high school and junior college, I also watch railroad cars.

I am writing to ask questions.

I would like to ask about the diesel engines used in DRS operation class 88 locomotives and ROG operation class 93 locomotives.

I have confirmed that DRS operation class 88 locomotives use Caterpillar-made C27 engines.

In the case of ROG operation class 93 locomotives, I have confirmed that Caterpillar-made C32 diesel engines are used.

What I want to ask here is, I want to know the exhaust gas treatment method, and I wonder if it uses SCR (Selective Catalytic Reduction) method.

Or I want to know if it uses EGR (Exhaust Gas Recirculation).

I looked at the site of Caterpillar, a diesel engine manufacturer, but I'm confused, so I want to know exactly.

For your information, I also know about EGR (Exhaust Gas Recirculation) and SCR (Selective Catalytic Reduction) exhaust gas treatment methods, but I can't find any information on Wikipedia, so I'm asking.

Translated from Korean to English with Google Translate. There may be grammar mistakes, so please forgive me.

 

[ac6000cw]

Data sheet for the EU Stage V Cat C32 rail engine - https://www.zeppelin.com/content/da.../produkte/motoren/lok-motoren/LEHR0022-01.pdf

Quote from the data sheet:

Emissions

Meets EU Stage V Locomotive emission standards

On-engine NOx Reduction System (NRS) with
optimized piston, ring, liner, and fuel system
configuration to reduce NOx while minimizing
in-cylinder sooting

Aftertreatment features diesel oxidation catalyst

Data sheet for the EU Stage V Cat C27 rail engine - https://www.zeppelin.com/content/da.../produkte/motoren/lok-motoren/LEHR0010-01.pdf

Quote from the data sheet:

Emissions

Meets EU Stage V Locomotive emission standards

On-engine NOx Reduction System (NRS) with
optimized piston, ring, liner, and fuel system
configuration to reduce NOx while minimizing
in-cylinder sooting

Aftertreatment features diesel oxidation catalyst

...so based on the engine data sheets, they use EGR but not SCR - a quote from Cat's 'EMISSIONS ACRONYMS, DECODED' webpage about NRS:

NRS	NOx Reduction System NRS reduces the levels of NOx emitted by an engine by recirculating exhaust gas into the engine’s cylinder and replacing some of the air with carbon dioxide. That lowers combustion temperature and reduces the amount of NOx formed.

 

[yh00157]

Data sheet for the EU Stage V Cat C32 rail engine - https://www.zeppelin.com/content/da.../produkte/motoren/lok-motoren/LEHR0022-01.pdf

Quote from the data sheet:


Data sheet for the EU Stage V Cat C27 rail engine - https://www.zeppelin.com/content/da.../produkte/motoren/lok-motoren/LEHR0010-01.pdf

Quote from the data sheet:


...so based on the engine data sheets, they use EGR but not SCR - a quote from Cat's 'EMISSIONS ACRONYMS, DECODED' webpage about NRS:

Okay, thank you.