In the past eight years, GE has produced 1,117 "Tier 4" units for US railroads, including 300 for BNSF. That may seem like a lot, but when you consider the immediate predecessor (ES44AC/DC/C4) had 6,451 units produced, you can see the difference. The train held for about 15 minutes at east Leyden while waiting for maintenance to clear up.
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