TEBU, (Tractive Effort Booster Unit), #1600 at the Eugene Roundhouse. These unique locomotives were slave units and required a power supply from other locomotives. The SP could use 1 GP-40 coupled to one end to power both sets of trucks on the TEBU, or 2 GP-40s coupled to both ends, each unit powering 1 truck.
Regular assignment for the TEBU sets was the Toledo Hauler. On occasion, the Cascade Line helper sets were all in operation, which required the use of the TEBU sets during the layover days in Eugene.
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This photo shows the group of cables required for slave operation.