Penn Central SD45 #6230 on the other end of the GM10B test train, (the business end seen in photo ID 690368). A Walter Schopp original Koda... (more)

Penn Central SD45 #6230 on the other end of the GM10B test train, (the business end seen in photo ID 690368). A Walter Schopp original Koda... (more)

EMD Demonstrator 1976 with its test train. The other end of this train can be seen in photo ID 692181). A Walter Schopp original Kodachrom... (more)

ASEA Demonstrator X995 with a test extra at Trenton. The success of the Swedish RC4 motor on these tests would lead to the AEM7 a couple years later. A Walter Schopp original Kodachrome slide fr... (more)