The electronic train set operated using a variable frequency vacuum tube based RF transmitter and individual receivers in the cars that were tuned to activate when a specific frequency signal was sent to them. To set the specific frequency (that would activate a certain car), RC circuits were used for the tuning. With time the vacuum tube performance declines, the capacitors dry out, the values change and the tuning capability is lost, If new components are used to replace the old, I see no reason why this system would not work, Its really a very simple design.
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