Rock Island´s Lafayette Coal Train

[stephanh]

Hello,

can anybody tell me when Rock Island stopped using the legendary GP9-F7B-F7B-F7B-GP9 lashup that was mainly used on the Lafayette coal train?

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I found some Pictures stating that in 1974 the traction still existed. It was used to pull other freight trains, too.
But I cannot find any information of how long the consist existed. As I model 1979 I´d like to know if it still existed then.
Please help!

Regards


Stephan