I connected the socket to the remote control system, the locomotive didn't run smoothly. It seems the electricity is being modulated through the internal circuit board. And then to test whether that socket has a direct connection to the motor, I inserted a direct line from an LGB power line to the socket, the motor didn't run and the locomotive has very dim light. It may explain that the socket does not directly link to the motor but rather modulated through a circuit board. It could be used for lights but not for powering the locomotive.