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Re: The Return Of ''Rapid'' Transit ?

Posted by Stephen Bauman on Tue Jan 15 23:45:50 2019, in response to Re: The Return Of ''Rapid'' Transit ?, posted by Michael549 on Tue Jan 15 15:57:25 2019.

The signal system of the 1920-1930's & 1940's was a kind of analog computer

An analog circuit is one where inputs and outputs can have continuous values. Mathematically,

for all values x0 < x1 there exists a value x such that x0 < x < x1.

track detection elements serving as a kind of input sensors,

track detection circuits are the very embodiment of digital sensors that can take on only 2 values: train present or train absent. These are typically represented by 0 volts for train present and some voltage > 0 for train absent.

Analog computers are composed of operational amplifiers and integrators that are wired together. The connections, op amps and integrators are designed to solve simultaneous differential equations to an excitation derived from a signal generator. That's nothing like what the "current" or any signal system does, regardless of its age.

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