diff --git a/CommandDistributor.cpp b/CommandDistributor.cpp
index 9684291..7ff17bc 100644
--- a/CommandDistributor.cpp
+++ b/CommandDistributor.cpp
@@ -205,6 +205,39 @@ int16_t CommandDistributor::retClockTime() {
 void  CommandDistributor::broadcastLoco(byte slot) {
   DCC::LOCO * sp=&DCC::speedTable[slot];
   broadcastReply(COMMAND_TYPE, F("<l %d %d %d %l>\n"), sp->loco,slot,sp->speedCode,sp->functions);
+#ifdef SABERTOOTH
+  if (Serial2 && sp->loco == SABERTOOTH) {
+    static uint8_t rampingmode = 0;
+    bool direction = (sp->speedCode & 0x80) !=0; // true for forward
+    int32_t speed = sp->speedCode & 0x7f;
+    if (speed == 1) { // emergency stop
+      if (rampingmode != 1) {
+	rampingmode = 1;
+	Serial2.print("R1: 0\r\n");
+	Serial2.print("R2: 0\r\n");
+      }
+      Serial2.print("MD: 0\r\n");
+    } else {
+      if (speed != 0) {
+        // speed is here 2 to 127
+	speed = (speed - 1) * 1625 / 100;
+	speed = speed * (direction ? 1 : -1);
+	// speed is here -2047 to 2047
+      }
+      if (rampingmode != 2) {
+	rampingmode = 2;
+	Serial2.print("R1: 2047\r\n");
+	Serial2.print("R2: 2047\r\n");
+      }
+      Serial2.print("M1: ");
+      Serial2.print(speed);
+      Serial2.print("\r\n");
+      Serial2.print("M2: ");
+      Serial2.print(speed);
+      Serial2.print("\r\n");
+    }
+  }
+#endif
 #ifdef CD_HANDLE_RING
   WiThrottle::markForBroadcast(sp->loco);
 #endif
diff --git a/GITHUB_SHA.h b/GITHUB_SHA.h
index 3934c8e..355e2e9 100644
--- a/GITHUB_SHA.h
+++ b/GITHUB_SHA.h
@@ -1 +1 @@
-#define GITHUB_SHA "devel-202305091210Z"
+#define GITHUB_SHA "devel-202305201256Z"
diff --git a/SerialManager.cpp b/SerialManager.cpp
index 0ac567d..bacfceb 100644
--- a/SerialManager.cpp
+++ b/SerialManager.cpp
@@ -87,6 +87,9 @@ void SerialManager::init() {
     delay(1000);
   }
 #endif
+#ifdef SABERTOOTH
+  Serial2.begin(9600, SERIAL_8N1, 16, 17); // GPIO 16 RXD2; GPIO 17 TXD2 on ESP32
+#endif
 }
 
 void SerialManager::broadcast(char * stringBuffer) {
diff --git a/config.example.h b/config.example.h
index 11852c5..ec4c210 100644
--- a/config.example.h
+++ b/config.example.h
@@ -235,5 +235,15 @@ The configuration file for DCC-EX Command Station
 //
 //#define SERIAL_BT_COMMANDS
 
+// SABERTOOTH
+//
+// This is a very special option and only useful if you happen to have a
+// sabertooth motor controller from dimension engineering configured to
+// take commands from and ESP32 via serial at 9600 baud from GPIO17 (TX)
+// and GPIO16 (RX, currently unused).
+// The number defined is the DCC address for which speed controls are sent
+// to the sabertooth controller _as_well_. Default: Undefined.
+//
+//#define SABERTOOTH 1
 
 /////////////////////////////////////////////////////////////////////////////////////
diff --git a/version.h b/version.h
index 09aa737..fc4ee3c 100644
--- a/version.h
+++ b/version.h
@@ -4,7 +4,8 @@
 #include "StringFormatter.h"
 
 
-#define VERSION "4.2.51"
+#define VERSION "4.2.52"
+// 4.2.52 - Experimental support for sabertooth motor controller on ESP32
 // 4.2.51 - Add DISABLE_PROG to disable programming to save RAM/Flash
 // 4.2.50 - Fixes: estop all, turnout eeprom, cab ID check
 // 4.2.49 - Exrail SPEED take notice of external direction change