diff --git a/DCCEXParser.cpp b/DCCEXParser.cpp
index f4f3fa5..1202506 100644
--- a/DCCEXParser.cpp
+++ b/DCCEXParser.cpp
@@ -631,7 +631,23 @@ void DCCEXParser::parseOne(Print *stream, byte *com, RingStream * ringStream)
 	    else break; // will reply <X>
 	  }
 	  //TrackManager::streamTrackState(NULL,t);
-          
+
+    TrackManager::setTrackPowerF439ZI(0);
+    TrackManager::setTrackPowerF439ZI(1);
+    TrackManager::setTrackPowerF439ZI(2);
+    TrackManager::setTrackPowerF439ZI(3);
+    TrackManager::setTrackPowerF439ZI(4);
+    TrackManager::setTrackPowerF439ZI(5);
+    TrackManager::setTrackPowerF439ZI(6);
+    TrackManager::setTrackPowerF439ZI(7);
+    TrackManager::setTrackPowerF439ZI(0);  // repeated in case the <F29..31 was
+    TrackManager::setTrackPowerF439ZI(1);  // set on a later track than power
+    TrackManager::setTrackPowerF439ZI(2);  // Note: this retains power but prevents
+    TrackManager::setTrackPowerF439ZI(3);  //       speed doubling.
+    TrackManager::setTrackPowerF439ZI(4);
+    TrackManager::setTrackPowerF439ZI(5);
+    TrackManager::setTrackPowerF439ZI(6);
+
 	  return;
 	}
             
diff --git a/DCCTimerSTM32.cpp b/DCCTimerSTM32.cpp
index a7976e7..8ab3c5e 100644
--- a/DCCTimerSTM32.cpp
+++ b/DCCTimerSTM32.cpp
@@ -344,7 +344,7 @@ void DCCTimer::DCCEXanalogWriteFrequencyInternal(uint8_t pin, uint32_t frequency
     if (pin_timer[pin] != NULL)
     {
       pin_timer[pin]->setPWM(pin_channel[pin], pin, frequency, 0); // set frequency in Hertz, 0% dutycycle
-      DIAG(F("DCCEXanalogWriteFrequency::Pin %d on Timer Channel %d, frequency %d"), pin, pin_channel[pin], frequency);
+      DIAG(F("DCCEXanalogWriteFrequency::Pin %d on Timer %d Channel %d, frequency %d"), pin, pin_timer[pin], pin_channel[pin], frequency);
       resetCounterDCmodeTimers();
     }
     else
@@ -353,6 +353,7 @@ void DCCTimer::DCCEXanalogWriteFrequencyInternal(uint8_t pin, uint32_t frequency
   else
   {
     // Frequency change request
+    //DIAG(F("DCCEXanalogWriteFrequency_356::pin %d frequency %d"), pin, frequency);
     if (frequency != channel_frequency[pin])
     {
       pinmap_pinout(digitalPinToPinName(pin), PinMap_TIM); // ensure the pin has been configured!
diff --git a/MotorDriver.cpp b/MotorDriver.cpp
index b7df4a1..550b874 100644
--- a/MotorDriver.cpp
+++ b/MotorDriver.cpp
@@ -371,7 +371,9 @@ void MotorDriver::setDCSignal(byte speedcode, uint8_t frequency /*default =0*/)
     }
 #endif
     //DIAG(F("Brake pin %d value %d freqency %d"), brakePin, brake, f);
+    //DIAG(F("MotorDriver_cpp_374_DCCEXanalogWriteFequency::Pin %d, frequency %d, tSpeed %d"), brakePin, f, tSpeed);
     DCCTimer::DCCEXanalogWriteFrequency(brakePin, f); // set DC PWM frequency
+    //DIAG(F("MotorDriver_cpp_375_DCCEXanalogWrite::brakePin %d, frequency %d, invertBrake"), brakePin, brake, invertBrake);
     DCCTimer::DCCEXanalogWrite(brakePin, brake, invertBrake);  // line swapped to set frequency first
 #else // all AVR here
     DCCTimer::DCCEXanalogWriteFrequency(brakePin, frequency); // frequency steps
diff --git a/TrackManager.cpp b/TrackManager.cpp
index 25004a5..241ab90 100644
--- a/TrackManager.cpp
+++ b/TrackManager.cpp
@@ -738,3 +738,38 @@ TRACK_MODE TrackManager::getMode(byte t) {
 int16_t TrackManager::returnDCAddr(byte t) {
     return (trackDCAddr[t]);
 }
+
+// Set track power for EACH track, independent of mode 
+// This updates the settings so that speed is correct
+// following a frequency change - DC mode
+void TrackManager::setTrackPowerF439ZI(byte t) {
+  MotorDriver *driver=track[t];
+  if (driver == NULL) { // track is not defined at all
+   // DIAG(F("Error: Track %c does not exist"), t+'A');
+    return;
+  }
+  TRACK_MODE trackmode = driver->getMode();
+  POWERMODE powermode = driver->getPower();   // line added to enable processing for DC mode tracks
+  POWERMODE oldpower = driver->getPower();
+  //if (trackmode & TRACK_MODE_NONE) {
+  //  driver->setBrake(true);     // Track is unused. Brake is good to have.
+  //  powermode = POWERMODE::OFF; // Track is unused. Force it to OFF
+  //} else 
+  if (trackmode & TRACK_MODE_DC) { // includes inverted DC (called DCX)
+    if (powermode == POWERMODE::ON) {
+      driver->setBrake(true);   // DC starts with brake on
+      applyDCSpeed(t);          // speed match DCC throttles
+    }
+  } 
+  //else /* MAIN PROG EXT BOOST */ {
+  //  if (powermode == POWERMODE::ON) {
+  //    // toggle brake before turning power on - resets overcurrent error
+  //    // on the Pololu board if brake is wired to ^D2.
+  //    driver->setBrake(true);
+  //    driver->setBrake(false); // DCC runs with brake off
+  //  }
+  //}
+  driver->setPower(powermode);
+  if (oldpower != driver->getPower())
+    CommandDistributor::broadcastPower();
+}
\ No newline at end of file
diff --git a/TrackManager.h b/TrackManager.h
index 5d6b907..8009c38 100644
--- a/TrackManager.h
+++ b/TrackManager.h
@@ -67,6 +67,7 @@ class TrackManager {
   
     static void setPower(POWERMODE mode) {setMainPower(mode); setProgPower(mode);}
     static void setTrackPower(POWERMODE mode, byte t);
+    static void setTrackPowerF439ZI(byte t);
     static void setTrackPower(TRACK_MODE trackmode, POWERMODE powermode);
     static void setMainPower(POWERMODE mode) {setTrackPower(TRACK_MODE_MAIN, mode);}
     static void setProgPower(POWERMODE mode) {setTrackPower(TRACK_MODE_PROG, mode);}