diff --git a/CommandDistributor.cpp b/CommandDistributor.cpp
index 961df38..3fe1e96 100644
--- a/CommandDistributor.cpp
+++ b/CommandDistributor.cpp
@@ -155,6 +155,7 @@ void  CommandDistributor::broadcastTurnout(int16_t id, bool isClosed ) {
 #endif
 }
 
+#ifdef USEFASTCLOCK 
 void  CommandDistributor::broadcastClockTime(int16_t time, int8_t rate) {
   // The JMRI clock command is of the form : PFT65871<;>4
   // The CS broadcast is of the form "<jC mmmm nn" where mmmm is time minutes and dd speed
@@ -165,6 +166,7 @@ void  CommandDistributor::broadcastClockTime(int16_t time, int8_t rate) {
   broadcastReply(WITHROTTLE_TYPE, F("PFT%d<;>%d\n"), time*60, rate);
 #endif
 }
+#endif
 
 void  CommandDistributor::broadcastLoco(byte slot) {
   DCC::LOCO * sp=&DCC::speedTable[slot];
diff --git a/CommandDistributor.h b/CommandDistributor.h
index c816b94..d51b2b6 100644
--- a/CommandDistributor.h
+++ b/CommandDistributor.h
@@ -45,7 +45,9 @@ public :
   static void broadcastLoco(byte slot);
   static void broadcastSensor(int16_t id, bool value);
   static void broadcastTurnout(int16_t id, bool isClosed);
+#ifdef USEFASTCLOCK 
   static void broadcastClockTime(int16_t time, int8_t rate);
+#ifdef
   static void broadcastPower();
   static void broadcastText(const FSH * msg);
   template<typename... Targs> static void broadcastReply(clientType type, Targs... msg);
diff --git a/DCCEXParser.cpp b/DCCEXParser.cpp
index 486ef32..3898f95 100644
--- a/DCCEXParser.cpp
+++ b/DCCEXParser.cpp
@@ -97,7 +97,9 @@ Print *DCCEXParser::stashStream = NULL;
 RingStream *DCCEXParser::stashRingStream = NULL;
 byte DCCEXParser::stashTarget=0;
 
+#ifdef USEFASTCLOCK
 int16_t lastclocktime = 0;
+#endif
 
 // This is a JMRI command parser.
 // It doesnt know how the string got here, nor how it gets back.
@@ -572,9 +574,15 @@ void DCCEXParser::parseOne(Print *stream, byte *com, RingStream * ringStream)
 
     case 'J' : // throttle info access
         {
+#ifdef USEFASTCLOCK
             if ((params<1) | (params>3)) break; // <J>
+#endif
+#ifndef USEFASTCLOCK
+            if ((params<1) | (params>2)) break; // <J>
+#endif
             int16_t id=(params==2)?p[1]:0;
             switch(p[0]) {
+#ifdef USEFASTCLOCK 
                 case HASH_KEYWORD_C: // <JC mmmm nn> sets time and speed
                     if (params==1) { // <JC> returns latest time
                         StringFormatter::send(stream, F("<jC %d>\n"), lastclocktime);
@@ -593,6 +601,7 @@ void DCCEXParser::parseOne(Print *stream, byte *com, RingStream * ringStream)
                         lastclocktime = p[1];
                     }
                     return;
+#endif
                 case HASH_KEYWORD_A: // <JA> returns automations/routes
                     StringFormatter::send(stream, F("<jA"));
                     if (params==1) {// <JA>
diff --git a/EXRAIL2.cpp b/EXRAIL2.cpp
index f969544..1b5b51e 100644
--- a/EXRAIL2.cpp
+++ b/EXRAIL2.cpp
@@ -92,7 +92,9 @@ LookList *  RMFT2::onRedLookup=NULL;
 LookList *  RMFT2::onAmberLookup=NULL;
 LookList *  RMFT2::onGreenLookup=NULL;
 LookList *  RMFT2::onChangeLookup=NULL;
+#ifdef USEFASTCLOCK
 LookList *  RMFT2::onClockLookup=NULL;
+#endif
 
 #define GET_OPCODE GETHIGHFLASH(RMFT2::RouteCode,progCounter)
 #define SKIPOP progCounter+=3
@@ -176,7 +178,9 @@ LookList* RMFT2::LookListLoader(OPCODE op1, OPCODE op2, OPCODE op3) {
   onAmberLookup=LookListLoader(OPCODE_ONAMBER);
   onGreenLookup=LookListLoader(OPCODE_ONGREEN);
   onChangeLookup=LookListLoader(OPCODE_ONCHANGE);
+  #ifdef USEFASTCLOCK
   onClockLookup=LookListLoader(OPCODE_ONTIME);
+  #endif
 
   // Second pass startup, define any turnouts or servos, set signals red
   // add sequences onRoutines to the lookups
@@ -977,7 +981,9 @@ void RMFT2::loop2() {
   case OPCODE_ONAMBER:
   case OPCODE_ONGREEN:
   case OPCODE_ONCHANGE:
+  #ifdef USEFASTCLOCK
   case OPCODE_ONTIME:
+  #endif
   
     break;
     
@@ -1110,12 +1116,14 @@ void RMFT2::changeEvent(int16_t vpin, bool change) {
   if (change)  handleEvent(F("CHANGE"),onChangeLookup,vpin);
 }
 
+#ifdef USEFASTCLOCK
 void RMFT2::clockEvent(int16_t clocktime, bool change) {
   // Hunt for an ONTIME for this time
   if (Diag::CMD)
    DIAG(F("Looking for clock event at : %d"), clocktime);
-  if (change)  handleEvent(F("CHANGE"),onClockLookup,clocktime);
+  if (change)  handleEvent(F("CLOCK"),onClockLookup,clocktime);
 } 
+#endif
 
 void RMFT2::handleEvent(const FSH* reason,LookList* handlers, int16_t id) {
   int pc= handlers->find(id);
diff --git a/EXRAIL2.h b/EXRAIL2.h
index 69fd382..7f04458 100644
--- a/EXRAIL2.h
+++ b/EXRAIL2.h
@@ -55,8 +55,10 @@ enum OPCODE : byte {OPCODE_THROW,OPCODE_CLOSE,
              OPCODE_SET_TRACK,
              OPCODE_ONRED,OPCODE_ONAMBER,OPCODE_ONGREEN,
              OPCODE_ONCHANGE,
+#ifdef USEFASTCLOCK 
              OPCODE_ONCLOCKTIME,
              OPCODE_ONTIME,
+#endif
 
              // OPcodes below this point are skip-nesting IF operations
              // placed here so that they may be skipped as a group
@@ -118,7 +120,9 @@ class LookList {
     static void turnoutEvent(int16_t id, bool closed);  
     static void activateEvent(int16_t addr, bool active);
     static void changeEvent(int16_t id, bool change);
+  #ifdef USEFASTCLOCK 
     static void clockEvent(int16_t clocktime, bool change);
+  #endif
     static const int16_t SERVO_SIGNAL_FLAG=0x4000;
     static const int16_t ACTIVE_HIGH_SIGNAL_FLAG=0x2000;
     static const int16_t DCC_SIGNAL_FLAG=0x1000;
@@ -176,7 +180,9 @@ private:
    static LookList * onAmberLookup;
    static LookList * onGreenLookup;
    static LookList * onChangeLookup;
+#ifdef USEFASTCLOCK 
    static LookList * onClockLookup;
+#endif
     
   // Local variables - exist for each instance/task 
     RMFT2 *next;   // loop chain 
diff --git a/EXRAIL2MacroReset.h b/EXRAIL2MacroReset.h
index a5e6d90..409cdcd 100644
--- a/EXRAIL2MacroReset.h
+++ b/EXRAIL2MacroReset.h
@@ -86,8 +86,10 @@
 #undef ONDEACTIVATE
 #undef ONDEACTIVATEL 
 #undef ONCLOSE
+#ifdef USEFASTCLOCK 
 #undef ONTIME
 #undef ONCLOCKTIME
+#endif
 #undef ONGREEN
 #undef ONRED
 #undef ONTHROW 
@@ -200,8 +202,10 @@
 #define ONACTIVATE(addr,subaddr)
 #define ONACTIVATEL(linear)
 #define ONAMBER(signal_id) 
+#ifdef USEFASTCLOCK 
 #define ONTIME(value)
 #define ONCLOCKTIME(hours,mins)
+#endif
 #define ONDEACTIVATE(addr,subaddr)
 #define ONDEACTIVATEL(linear) 
 #define ONCLOSE(turnout_id)
diff --git a/EXRAILMacros.h b/EXRAILMacros.h
index 7ef3acd..0d807d1 100644
--- a/EXRAILMacros.h
+++ b/EXRAILMacros.h
@@ -55,13 +55,11 @@
 // helper macro for turnout description as HIDDEN 
 #define HIDDEN "\x01"
 
+#ifdef USEFASTCLOCK 
 // helper macro to strip leading zeros off time inputs
 // (10#mins)%100)
 #define STRIP_ZERO(value) 10##value%100
-
-// helper macro to strip leading zeros off time inputs
-// (10#mins)%100)
-#define STRIP_ZERO(value) 10##value%100
+#endif
 
 // Pass 1 Implements aliases 
 #include "EXRAIL2MacroReset.h"
@@ -305,8 +303,10 @@ const  HIGHFLASH  int16_t RMFT2::SignalDefinitions[] = {
 #define ONACTIVATEL(linear) OPCODE_ONACTIVATE,V(linear+3),
 #define ONAMBER(signal_id) OPCODE_ONAMBER,V(signal_id),
 #define ONCLOSE(turnout_id) OPCODE_ONCLOSE,V(turnout_id),
+#ifdef USEFASTCLOCK 
 #define ONTIME(value) OPCODE_ONTIME,V(value),  
 #define ONCLOCKTIME(hours,mins) OPCODE_ONTIME,V((STRIP_ZERO(hours)*60)+STRIP_ZERO(mins)),
+#endif
 #define ONDEACTIVATE(addr,subaddr) OPCODE_ONDEACTIVATE,V(addr<<2|subaddr),
 #define ONDEACTIVATEL(linear) OPCODE_ONDEACTIVATE,V(linear+3),
 #define ONGREEN(signal_id) OPCODE_ONGREEN,V(signal_id),
diff --git a/IO_EXFastclock.h b/IO_EXFastclock.h
index c9985f2..22bb94e 100644
--- a/IO_EXFastclock.h
+++ b/IO_EXFastclock.h
@@ -26,8 +26,8 @@
 */
 
 #ifndef IO_EXFastclock_h
-  #define IO_EXFastclock_h
-#endif
+#define IO_EXFastclock_h
+
 
 #include "IODevice.h"
 #include "I2CManager.h"
@@ -55,12 +55,12 @@ static void EXFastClock::create(uint8_t _I2CAddress) {
   DIAG(F("Clock check result - %d"), _checkforclock);
   if (_checkforclock == 0) {
       FAST_CLOCK_EXISTS = true;
-      DIAG(F("I2C Fast Clock found at x%x"), _I2CAddress);
+      //DIAG(F("I2C Fast Clock found at x%x"), _I2CAddress);
       new EXFastClock(_I2CAddress); 
     }
     else {
       FAST_CLOCK_EXISTS = false;
-      DIAG(F("No Fast Clock found"));
+      //DIAG(F("No Fast Clock found"));
       LCD(6,F("CLOCK NOT FOUND"));
     }
     
@@ -85,7 +85,7 @@ void _begin() override {
       #endif
     } else {
     _deviceState = DEVSTATE_FAILED;
-    LCD(6,F("CLOCK NOT FOUND")); 
+    //LCD(6,F("CLOCK NOT FOUND")); 
     DIAG(F("Fast Clock Not Found at address %d"), _I2CAddress);
     }
   }
@@ -107,8 +107,8 @@ void _loop(unsigned long currentMicros) override{
 
         if (_clocktime != _previousclocktime) {
             _previousclocktime = _clocktime;
-            if (Diag::CMD)
-              DIAG(F("Received Clock Time is: %d at rate: %d"), _clocktime, _clockrate);
+            //if (Diag::CMD)
+            //  DIAG(F("Received Clock Time is: %d at rate: %d"), _clocktime, _clockrate);
             LCD(6,F(("Clk Time:%d Sp %d")), _clocktime, _clockrate);
             RMFT2::clockEvent(_clocktime,1);
             // Now tell everyone else what the time is.
@@ -132,3 +132,5 @@ void _display() {
   DIAG(F("FastCLock on I2C:x%x - %S"), _I2CAddress,  (_deviceState==DEVSTATE_FAILED) ? F("OFFLINE") : F(""));
 }
 };
+
+#endif
diff --git a/config.example.h b/config.example.h
index aae18a9..a2d97c5 100644
--- a/config.example.h
+++ b/config.example.h
@@ -224,4 +224,8 @@ The configuration file for DCC-EX Command Station
 //
 //#define SERIAL_BT_COMMANDS
 
+
+// FastClock Enabler
+// To build the FastClock code into the CS please uncomment the line below
+//#define USEFASTCLOCK
 /////////////////////////////////////////////////////////////////////////////////////