diff --git a/Release_Notes/EXRAIL additions.md b/Release_Notes/EXRAIL additions.md
deleted file mode 100644
index 690ff0a..0000000
--- a/Release_Notes/EXRAIL additions.md	
+++ /dev/null
@@ -1,38 +0,0 @@
-
-BLINK(vpin, onMs,offMs)
-
-which will start a vpin blinking until such time as it is SET, RESET or set by a signal operation such as RED, AMBER, GREEN. 
-
-BLINK returns immediately, the blinking is autonomous. 
-
-This means a signal that always blinks amber could be done like this:
-```
-SIGNAL(30,31,32)
-ONAMBER(30) BLINK(31,500,500) DONE
-```
-The RED or GREEN calls will turn off the amber blink automatically.
-
-Alternatively a signal that has normal AMBER and flashing AMBER could be like this:
-
-#define FLASHAMBER(signal) \
-                AMBER(signal) \
-                BLINK(signal+1,500,500)
-  
-  (Caution: this issumes that the amber pin is redpin+1)
-
-  ==
-
-  FTOGGLE(function)
-   Toggles the current loco function (see FON and FOFF)
-
-  XFTOGGLE(loco,function)
-     Toggles the function on given loco. (See XFON, XFOFF)
-
-  TOGGLE_TURNOUT(id) 
-      Toggles the turnout (see CLOSE, THROW)
-
-  STEALTH_GLOBAL(code) 
-      ADVANCED C++ users only.
-      Inserts code such as static variables and functions that 
-      may be utilised by multiple STEALTH operations.
-       
\ No newline at end of file
diff --git a/Release_Notes/Exrail mods.txt b/Release_Notes/Exrail mods.txt
index 68f57b7..6f8287f 100644
--- a/Release_Notes/Exrail mods.txt	
+++ b/Release_Notes/Exrail mods.txt	
@@ -1,3 +1,24 @@
+// 5.2.49 
+
+Which is a more efficient than the AT/AFTER/IF methods 
+of handling buttons and switches, especially on MIMIC panels. 
+
+ONBUTTON(vpin) 
+  handles debounce and starts a task if a button is used to 
+  short a pin to ground. 
+
+  for example:
+     ONBUTTON(30) TOGGLE_TURNOUT(30) DONE
+
+ONSENSOR(vpin) 
+   handles debounce and starts a task if the pin changes.
+   You may want to check the pin state with an IF ...
+
+Note the ONBUTTON and ONSENSOR are not generally useful 
+for track sensors and running trains, because you dont know which
+train triggered the sensor.  
+
+// 5.2.47
 
 BLINK(vpin, onMs,offMs)
 
diff --git a/version.h b/version.h
index e871738..395630a 100644
--- a/version.h
+++ b/version.h
@@ -3,7 +3,9 @@
 
 #include "StringFormatter.h"
 
-#define VERSION "5.2.48"
+#define VERSION "5.2.49"
+// 5.2.49 - EXRAIL additions:
+//          ONBUTTON, ONSENSOR
 // 5.2.48 - Bugfix: HALDisplay was generating I2C traffic prior to I2C being initialised
 // 5.2.47 - EXRAIL additions:
 //          STEALTH_GLOBAL