​Here is a patch to create a Perkins engined variant of the AP Northern Revised Class 158.

At the time of the Perkins Enhancement Pack’s release, No Perkins engine 158s had been refurbished into Northern Revised.
However now that at least one Perkins unit has been refurbished, I felt this patch was worthwhile making.

Requirements
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–RSC Network Southeast Class 159
–AP Class 158 Enhancement Pack (Cummins)
–AP Class 158 Enhancement Pack (Perkins)