diff --git a/code/redalert/bdata.cpp b/code/redalert/bdata.cpp
index b2d3db1..72e7a8c 100644
--- a/code/redalert/bdata.cpp
+++ b/code/redalert/bdata.cpp
@@ -2947,6 +2947,7 @@ BuildingTypeClass::BuildingTypeClass(
 
 	memset(CustomTheatrePalette, 0, sizeof(CustomTheatrePalette));
 	IdleAnimShape = NULL;
+	ActiveAnimAnimShape = NULL;
 
 	Anims[BSTATE_CONSTRUCTION].Start = 0;
 	Anims[BSTATE_CONSTRUCTION].Count = 1;
@@ -4005,6 +4006,7 @@ bool BuildingTypeClass::Read_INI(CCINIClass & ini)
 {
 	char customPalName[512];
 	char idleAnimName[512];
+	char ConstructAnimName[512];
 
 	if (TechnoTypeClass::Read_INI(ini)) {
 		Speed = ini.Get_Bool(Name(), "WaterBound", (Speed == SPEED_FLOAT)) ? SPEED_FLOAT : SPEED_NONE;
@@ -4028,6 +4030,10 @@ bool BuildingTypeClass::Read_INI(CCINIClass & ini)
 			IdleAnimShape = MFCD::Retrieve(idleAnimName);
 		}
 
+		if (ini.Get_String(Name(), "ActiveAnim", "", &ConstructAnimName[0], sizeof(ConstructAnimName)) > 0) {
+			ActiveAnimAnimShape = MFCD::Retrieve(ConstructAnimName);
+		}
+
 		if (Power < 0) {
 			Drain = -Power;
 			Power = 0;
diff --git a/code/redalert/building.cpp b/code/redalert/building.cpp
index 03648ba..caf877c 100644
--- a/code/redalert/building.cpp
+++ b/code/redalert/building.cpp
@@ -474,21 +474,36 @@ void BuildingClass::Draw_It(int x, int y, WindowNumberType window) const
 		CCGlobalOveridePalette = (void *)Class->CustomTheatrePalette[LastTheater];
 	}
 
-	if (hdimage != NULL) {
-		Techno_Draw_Object_HD(hdimage, Shape_Number(), x, y, window);
-	}
-	else {
-		Techno_Draw_Object(shapefile, Shape_Number(), x, y, window);
+	{
+		int animShapeNum = Shape_Number();
+
+		// If we have a seperate activation animation, play that instead of cycling through the frames here.
+		if (BState == BSTATE_ACTIVE && Class->ActiveAnimAnimShape != NULL) {
+			animShapeNum = 0;
+		}
+
+		if (hdimage != NULL) {
+			Techno_Draw_Object_HD(hdimage, animShapeNum, x, y, window);
+		}
+		else {
+			Techno_Draw_Object(shapefile, animShapeNum, x, y, window);
+		}
 	}
 // jmarshall end
 	
-// jmarshall idle animation
+// jmarshall idle/construction animation
 	if (Class->IdleAnimShape != NULL) {
 		int shapeNum = animFrameNum;
 		shapeNum = shapeNum % Get_Build_Frame_Count(Class->IdleAnimShape);
 		Techno_Draw_Object(Class->IdleAnimShape, shapeNum, x, y, window);
 	}
 
+	if (BState == BSTATE_ACTIVE && Class->ActiveAnimAnimShape != NULL) {
+		int shapeNum = Shape_Number();
+		shapeNum = shapeNum % Get_Build_Frame_Count(Class->ActiveAnimAnimShape);
+		Techno_Draw_Object(Class->ActiveAnimAnimShape, shapeNum, x, y, window);
+	}
+
 	CCGlobalOveridePalette = NULL;
 // jmarshall end
 
diff --git a/code/redalert/type.h b/code/redalert/type.h
index 66dbe1e..bd44842 100644
--- a/code/redalert/type.h
+++ b/code/redalert/type.h
@@ -820,6 +820,7 @@ class BuildingTypeClass : public TechnoTypeClass {
 
 		const void* CustomTheatrePalette[3];
 		const void* IdleAnimShape;
+		const void* ActiveAnimAnimShape;
 	private:
 
 		/*
diff --git a/rules.ini b/rules.ini
index fbfd54a..427752d 100644
--- a/rules.ini
+++ b/rules.ini
@@ -1421,6 +1421,7 @@ Crewed=yes
 Snow=eapal1sno.pal
 Temperate=eapal1tem.pal
 IdleAnim=EACNST_A.SHP
+ActiveAnim=EACNST_WORKING.SHP
 
 ; refinery
 [PROC]