RE: LGB #50, D&RGW
Instead of wires, LGB used metal rods on the motor cases to get power from the wheels to the sliders and o to the connector to the electronics/wiring above.
These rods may be pulled out if necessary for service and then re-installed.
Many engines had the small brass/copper plate going into the spring area of the slider and had to be removed to get the sliders out.
This is part number 82in the 20630 diagram.
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