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Dear Wisser (Chad), <br /> <br />Yes, the 100Hz AC freq. remains the same, it's just chopped (coded) by relay contacts that are moving (coding) at the same rate (well, as close as an electro-mechanical relay can be) as the code that is placed onto the coil of the code follower relay. WE have code transmitters that work 24hrs/day that generate the 75, 120, and 180 beats per minute. Then, by relay selection, the signal system will apply the code rate to the coil of the code follower relay depending on the route (i.e. straight move, crossover move, what's up ahead, etc). Now, when we move up to 150mph from our present 125mph, we will be going to a 9 aspect cab code system, and, we will either send out coded 100Hz onto the rails, or, coded 100Hz and 250Hz. It is intended that the 100Hz AC voltage will be connected to a pair of front contacts (hot to one front, neutral to the other), then, apply 250Hz to the back contacts. A Clear 125 (for 125mph) would be 100Hz only and coded at the 180 code rate (180 beats per minute, or, 3Hz) which is the speed the relay hinges will be moving at. For a Clear 150 (150mph - for the Acela trains only), we would run the relay at the same 180 code rate, but, 100Hz would be placed on the front contacts, and, 250Hz would be on the back contacts. During the positive duty cycle of the DC code that's placed onto the coil of the code follower relay, 100Hz would be transmitted out onto the rails (from the front contacts of the relay). During the off period of coded DC's duty cycle, the 250Hz would be transmitted out to the rails via the back contacts of the code follower relay. I found a new railroad supplier company at www.phase2concepts.com that manufactures an electronic code follower relay that features a true electronic "break before make" feature. Go there and you'll hear about a 5 second sound bite of what an electro-mechanical code follower relay sounds like. Hope this explanantion helps, I sent you e-mail inviting you to give me a call out here on the eastcoast if you ever want to talk about this in depth! <br /> <br />tom
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