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简要介绍美国机车制造商和运营商为应对EPATier3和Tier4机车排放标准所作的准备,其中包括采用机内措施、排气后处理以及其他节能减排技术。
Briefly describe the preparations by US locomotive manufacturers and operators to meet EPATier3 and Tier4 locomotive emissions standards, including in-plant measures, exhaust aftertreatment, and other energy-saving and emission reduction technologies.