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Model Bus Journal No.425, September 2006
In This Month's Model Bus Journal.....
| Editorial In another issue brought to you from my temporary office, the Model Bus Journal takes a closer look at some of the latest products on the market, and comes right up-to-date with a plan of the month featuring the Euro 4-engined Enviro 400s, which recently entered service in London. Achievement of the reduced emissions demanded by the Euro 4 standard has caused engine developers to take two different routes. Mercedes and Cummins, for example, have chosen SCR (Selective Catalytic Reduction), where exhaust products are treated as they leave the engine, using an urea-based additive 'Ad-Blue' (urea is an organic compound of carbon, nitrogen, oxygen and hydrogen). This requires additional tankage at depots, and changes to filling procedures, but improves engine efficiency and fuel economy. Scania, amongst others, have chosen EGR (Exhaust Gas Recirculation), potentially a more complex process but avoiding the need for additives. Not much of the change may be visible on a model, but depot dioramas may need some new additions! David Cole, Editor, Model Bus Journal So, in another feature- packed 28-page issue, this month's highlights are….
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