These locomotives were introduced to service in 1952/53.
They are basically an EMD F3 unit but with a cab each end and C-C trucks.
The loco numbers were B 60 - B 85.
They ran mainline trains of all types.
Many of them ran to over 1,000,000 miles in service.
In the mid 1980's, eleven units were rebuilt to 2300hp and reclassed _A__ with the same numbers retained.