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Dera Wiser, <br /> <br /> There are also 270 and 420 code rates used (beats per minute). Amtrak plans to use the 270 code in the near future when we move from the 4 aspect cab signal system to the 9 aspect cab signal. Then, we will be placing 100Hz and 250Hz coded AC pulses on the rails. We use a 50 code rate for keeping relays in motion inside of interlockings because it was found we couldn't take a relay from a dead stop to 180 code quick enough when a train entered the interlocking. This was causing "cab flips" where a cab signal was displaying a "clear" but then dropped down to "restricting" then back up to "clear" again. Keeping a relay in motion at 50 code would allow it to jump to 180 code without the on-board cab signaling system seeing this (no more "cab flips").
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