diff --git a/bin/ai/regression/run.sh b/bin/ai/regression/run.sh
--- a/bin/ai/regression/run.sh
+++ b/bin/ai/regression/run.sh
@@ -2,14 +2,11 @@
 
 # $Id$
 
-if ! [ -f ai/regression/regression.nut ]; then
+if ! [ -f ai/regression/run.sh ]; then
 	echo "Make sure you are in the root of OpenTTD before starting this script."
 	exit 1
 fi
 
-cp ai/regression/regression.nut ai/regression/main.nut
-cp ai/regression/regression_info.nut ai/regression/info.nut
-
 if [ -f scripts/game_start.scr ]; then
 	mv scripts/game_start.scr scripts/game_start.scr.regression
 fi
@@ -22,15 +19,43 @@ fi
 if [ "$1" = "-g" ]; then
 	gdb="gdb --ex run --args "
 fi
-if [ -n "$gdb" ]; then
-	$gdb ./openttd -x -c ai/regression/regression.cfg $params -g ai/regression/regression.sav
+
+if [ -d "ai/regression/tst_$1" ]; then
+	tests="ai/regression/tst_$1"
+elif [ -d "ai/regression/tst_$2" ]; then
+	tests="ai/regression/tst_$2"
 else
-	./openttd -x -c ai/regression/regression.cfg $params -g ai/regression/regression.sav -d script=2 -d misc=9 2>&1 | awk '{ gsub("0x(\\(nil\\)|0+)(x0)?", "0x00000000", $0); gsub("^dbg: \\[script\\]", "", $0); gsub("^ ", "ERROR: ", $0); gsub("ERROR: \\[1\\] ", "", $0); gsub("\\[P\\] ", "", $0); print $0; }' | grep -v '^dbg: \[.*\]' > tmp.regression
+	tests=ai/regression/tst_*
 fi
 
 ret=0
+for tst in $tests; do
+	echo "running $tst"
+
+	# Make sure that only one info.nut is present for each test run. Otherwise openttd gets confused.
+	cp ai/regression/regression_info.nut $tst/info.nut
+
+	sav=$tst/test.sav
+	if ! [ -f $sav ]; then
+		sav=ai/regression/empty.sav
+	fi
+
+	if [ -n "$gdb" ]; then
+		$gdb ./openttd -x -c ai/regression/regression.cfg $params -g $sav
+	else
+		./openttd -x -c ai/regression/regression.cfg $params -g $sav -d script=2 -d misc=9 2>&1 | awk '{ gsub("0x(\\(nil\\)|0+)(x0)?", "0x00000000", $0); gsub("^dbg: \\[script\\]", "", $0); gsub("^ ", "ERROR: ", $0); gsub("ERROR: \\[1\\] ", "", $0); gsub("\\[P\\] ", "", $0); print $0; }' | grep -v '^dbg: \[.*\]' > tmp.regression
+	fi
+
+	if [ -z "$gdb" ]; then
+		# Ugly newline insertion, but it says /bin/sh above ...
+		res="$res
+`diff -ub $tst/result.txt tmp.regression`"
+	fi
+
+	rm $tst/info.nut
+done
+
 if [ -z "$gdb" ]; then
-	res="`diff -ub ai/regression/regression.txt tmp.regression`"
 	if [ -z "$res" ]; then
 		echo "Regression test passed!"
 	else
@@ -42,8 +67,6 @@ if [ -z "$gdb" ]; then
 	echo "Regression test done"
 fi
 
-rm -f ai/regression/main.nut ai/regression/info.nut
-
 if [ -f scripts/game_start.scr.regression ]; then
 	mv scripts/game_start.scr.regression scripts/game_start.scr
 fi