diff --git a/DCCEXParser.cpp b/DCCEXParser.cpp
index a133a2e..4875eec 100644
--- a/DCCEXParser.cpp
+++ b/DCCEXParser.cpp
@@ -1121,7 +1121,7 @@ bool DCCEXParser::parseC(Print *stream, int16_t params, int16_t p[]) {
         DCC::setGlobalSpeedsteps(128);
 	DIAG(F("128 Speedsteps"));
         return true;
-#if defined(HAS_ENOUGH_MEMORY) && !defined(ARDUINO_ARCH_UNO)
+#if defined(HAS_ENOUGH_MEMORY) && !defined(ARDUINO_ARCH_UNO) && !defined(ARDUINO_ARCH_ESP32)
     case "RAILCOM"_hk:
         {   // <C RAILCOM ON|OFF|DEBUG >
             if (params<2) return false;
diff --git a/DCCRMT.cpp b/DCCRMT.cpp
index afada7b..48d5369 100644
--- a/DCCRMT.cpp
+++ b/DCCRMT.cpp
@@ -84,7 +84,7 @@ void IRAM_ATTR interrupt(rmt_channel_t channel, void *t) {
     DCCTimer::updateMinimumFreeMemoryISR(0);
 }
 
-RMTChannel::RMTChannel(pinpair pins, bool isMain) {
+RMTChannel::RMTChannel(Pinpair pins, bool isMain) {
   byte ch;
   byte plen;
 
@@ -253,7 +253,7 @@ bool RMTChannel::addPin(byte pin, bool inverted) {
   if (err != ESP_OK) return false;
   return true;
 }
-bool RMTChannel::addPin(pinpair pins) {
+bool RMTChannel::addPin(Pinpair pins) {
   return addPin(pins.pin) && addPin(pins.invpin, true);
 }
 #endif //ESP32
diff --git a/DCCRMT.h b/DCCRMT.h
index 33257a0..4a2a068 100644
--- a/DCCRMT.h
+++ b/DCCRMT.h
@@ -23,7 +23,7 @@
 #include "driver/rmt.h"
 #include "soc/rmt_reg.h"
 #include "soc/rmt_struct.h"
-#include "MotorDriver.h" // for class pinpair
+#include "Pinpair.h" // for class Pinpair
 
 // make calculations easy and set up for microseconds
 #define RMT_CLOCK_DIVIDER 80
@@ -32,9 +32,9 @@
 
 class RMTChannel {
  public:
-  RMTChannel(pinpair pins, bool isMain);
+  RMTChannel(Pinpair pins, bool isMain);
   bool addPin(byte pin, bool inverted=0);
-  bool addPin(pinpair pins);
+  bool addPin(Pinpair pins);
   void IRAM_ATTR RMTinterrupt();
   void RMTprefill();
   //int RMTfillData(dccPacket packet);
diff --git a/DCCWaveform.cpp b/DCCWaveform.cpp
index 9c43730..d61de9d 100644
--- a/DCCWaveform.cpp
+++ b/DCCWaveform.cpp
@@ -126,22 +126,6 @@ volatile bool DCCWaveform::railcomActive=false;     // switched on by user
 volatile bool DCCWaveform::railcomDebug=false;     // switched on by user
 volatile bool DCCWaveform::railcomSampleWindow=false; // true during packet transmit
 
-bool DCCWaveform::isRailcom() {
-  return railcomActive;
-}
-
-bool DCCWaveform::isRailcomSampleWindow() {
-  return railcomSampleWindow;
-}
-bool DCCWaveform::isRailcomPossible() {
-  return railcomPossible;
-}
-
-void DCCWaveform::setRailcomPossible(bool yes) {
-  railcomPossible=yes;
-  if (!yes) setRailcom(false,false);
-}
-
 bool DCCWaveform::setRailcom(bool on, bool debug) {
   if (on && railcomPossible) {
     // TODO check possible
@@ -179,9 +163,12 @@ void DCCWaveform::interrupt2() {
     if (remainingPreambles==1) promotePendingPacket();
     else if (isMainTrack && railcomActive) {
       // cutout has ended so its now possible to poll the railcom detectors
-      if (remainingPreambles==5) railcomSampleWindow=true;
+      // requiredPreambles is one higher that preamble length so
+      // if preamble length is 16 then this evaluates to 5
+      if (remainingPreambles==(requiredPreambles-12)) railcomSampleWindow=true;
       // cutout can be ended when read
-      else if (remainingPreambles==14) DCCTimer::ackRailcomTimer();
+      // see above for requiredPreambles
+      else if (remainingPreambles==(requiredPreambles-3)) DCCTimer::ackRailcomTimer();
     }
     // Update free memory diagnostic as we don't have anything else to do this time.
     // Allow for checkAck and its called functions using 22 bytes more.
@@ -266,11 +253,13 @@ void DCCWaveform::promotePendingPacket() {
       transmitRepeats = 0;
       if (getResets() < 250) sentResetsSincePacket++; // only place to increment (private!)
 }
-#endif
+#endif //not ARDUINO_ARCH_ESP32
 
 #ifdef ARDUINO_ARCH_ESP32
 #include "DCCWaveform.h"
+#include "TrackManager.h"
 #include "DCCACK.h"
+#include "Pinpair.h"
 
 DCCWaveform  DCCWaveform::mainTrack(PREAMBLE_BITS_MAIN, true);
 DCCWaveform  DCCWaveform::progTrack(PREAMBLE_BITS_PROG, false);
@@ -283,7 +272,7 @@ DCCWaveform::DCCWaveform(byte preambleBits, bool isMain) {
 }
 void DCCWaveform::begin() {
   for(const auto& md: TrackManager::getMainDrivers()) {
-    pinpair p = md->getSignalPin();
+    Pinpair p = md->getSignalPin();
     if(rmtMainChannel) {
       //DIAG(F("added pins %d %d to MAIN channel"), p.pin, p.invpin);
       rmtMainChannel->addPin(p); // add pin to existing main channel
@@ -294,7 +283,7 @@ void DCCWaveform::begin() {
   }
   MotorDriver *md = TrackManager::getProgDriver();
   if (md) {
-    pinpair p = md->getSignalPin();
+    Pinpair p = md->getSignalPin();
     if (rmtProgChannel) {
       //DIAG(F("added pins %d %d to PROG channel"), p.pin, p.invpin);
       rmtProgChannel->addPin(p); // add pin to existing prog channel
@@ -352,7 +341,9 @@ void IRAM_ATTR DCCWaveform::loop() {
 }
 
 bool DCCWaveform::setRailcom(bool on, bool debug) {
-  // TODO... ESP32 railcom waveform
+  // todo
+  (void)on;
+  (void)debug;
   return false;
 }
 
diff --git a/DCCWaveform.h b/DCCWaveform.h
index 95de554..6bdbe15 100644
--- a/DCCWaveform.h
+++ b/DCCWaveform.h
@@ -25,7 +25,7 @@
 #define DCCWaveform_h
 #ifdef ARDUINO_ARCH_ESP32
 #include "DCCRMT.h"
-#include "TrackManager.h"
+//#include "TrackManager.h"
 #endif
 
 
@@ -84,10 +84,19 @@ class DCCWaveform {
     bool isReminderWindowOpen();
     void promotePendingPacket();
     static bool setRailcom(bool on, bool debug);
-    static bool isRailcom();
-    static bool isRailcomSampleWindow();
-    static bool isRailcomPossible();
-    static void setRailcomPossible(bool yes);
+    inline static bool isRailcom() {
+      return railcomActive;
+    };
+    inline static bool isRailcomSampleWindow() {
+      return railcomSampleWindow;
+    };
+    inline static bool isRailcomPossible() {
+      return railcomPossible;
+    };
+    inline static void setRailcomPossible(bool yes) {
+      railcomPossible=yes;
+      if (!yes) setRailcom(false,false);
+    };
   private:
 #ifndef ARDUINO_ARCH_ESP32
     volatile bool packetPending;
diff --git a/MotorDriver.h b/MotorDriver.h
index 3438c05..6ccc4f6 100644
--- a/MotorDriver.h
+++ b/MotorDriver.h
@@ -124,21 +124,9 @@ enum TRACK_MODE : byte {TRACK_MODE_NONE = 1, TRACK_MODE_MAIN = 2, TRACK_MODE_PRO
 
 // Virtualised Motor shield 1-track hardware Interface
 
-#ifndef UNUSED_PIN     // sync define with the one in MotorDrivers.h
-#define UNUSED_PIN 255 // inside uint8_t
-#endif
+#include "Pinpair.h" // for class Pinpair
 #define MAX_PIN 254
 
-class pinpair {
-public:
-  pinpair(byte p1, byte p2) {
-    pin = p1;
-    invpin = p2;
-  };
-  byte pin = UNUSED_PIN;
-  byte invpin = UNUSED_PIN;
-};
-
 #if defined(__IMXRT1062__) || defined(ARDUINO_ARCH_ESP8266) || defined(ARDUINO_ARCH_ESP32) || defined(ARDUINO_ARCH_SAMD) || defined(ARDUINO_ARCH_STM32)
 typedef uint32_t portreg_t;
 #else
@@ -209,7 +197,7 @@ class MotorDriver {
 	  pinMode(signalPin2, INPUT);
       }
     };
-    inline pinpair getSignalPin() { return pinpair(signalPin,signalPin2); };
+    inline Pinpair getSignalPin() { return Pinpair(signalPin,signalPin2); };
     inline int8_t getBrakePinSigned() { return invertBrake ? -brakePin : brakePin; };
     void setDCSignal(byte speedByte, uint8_t frequency=0);
     void throttleInrush(bool on);
@@ -285,7 +273,7 @@ class MotorDriver {
     else
       invertPhase = 0;
 #if defined(ARDUINO_ARCH_ESP32)
-    pinpair p = getSignalPin();
+    Pinpair p = getSignalPin();
     uint32_t *outreg = (uint32_t *)(GPIO_FUNC0_OUT_SEL_CFG_REG + 4*p.pin);
     if (invertPhase) // set or clear the invert bit in the gpio out register
       *outreg |=  ((uint32_t)0x1 << GPIO_FUNC0_OUT_INV_SEL_S);
diff --git a/Pinpair.h b/Pinpair.h
new file mode 100644
index 0000000..4452c51
--- /dev/null
+++ b/Pinpair.h
@@ -0,0 +1,14 @@
+#pragma once
+#ifndef UNUSED_PIN     // sync define with the one in MotorDrivers.h
+#define UNUSED_PIN 255 // inside uint8_t
+#endif
+class Pinpair {
+public:
+  Pinpair(byte p1, byte p2) {
+    pin = p1;
+    invpin = p2;
+  };
+  byte pin = UNUSED_PIN;
+  byte invpin = UNUSED_PIN;
+};
+
diff --git a/TrackManager.cpp b/TrackManager.cpp
index e1bd6d4..375f596 100644
--- a/TrackManager.cpp
+++ b/TrackManager.cpp
@@ -218,7 +218,7 @@ bool TrackManager::setTrackMode(byte trackToSet, TRACK_MODE mode, int16_t dcAddr
 
 #ifdef ARDUINO_ARCH_ESP32
     // remove pin from MUX matrix and turn it off
-    pinpair p = track[trackToSet]->getSignalPin();
+    Pinpair p = track[trackToSet]->getSignalPin();
     //DIAG(F("Track=%c remove  pin %d"),trackToSet+'A', p.pin);
     gpio_reset_pin((gpio_num_t)p.pin);
     if (p.invpin != UNUSED_PIN) {