diff --git a/line-colors.csv b/line-colors.csv
index 6538cd3..9037667 100644
--- a/line-colors.csv
+++ b/line-colors.csv
@@ -1316,18 +1316,18 @@ vbb-vip-bus,609,,5-vbbvib-609,#907d32,#ffffff,,pill
 vbb-vip-bus,612,,5-vbbvib-612,#842a26,#ffffff,,pill
 vbb-vip-bus,616,,5-vbbvib-616,#0155ae,#ffffff,,pill
 vbb-vip-bus,638,,5-vbbvib-638,#665fb1,#ffffff,,pill
-vbb-vip-bus,639,,5-vbbvib-639,#ffffff,#9e9ace,#9e9ace,pill
+vbb-vip-bus,639,,5-vbbvib-639,#f0eef6,#9e9ace,#9e9ace,pill
 vbb-vip-bus,690,,5-vbbvib-690,#446080,#ffffff,,pill
-vbb-vip-bus,691,,5-vbbvib-691,#ffffff,#ff9027,#ff9027,pill
+vbb-vip-bus,691,,5-vbbvib-691,#feeedd,#ff9027,#ff9027,pill
 vbb-vip-bus,692,,5-vbbvib-692,#00b9f2,#ffffff,,pill
 vbb-vip-bus,693,,5-vbbvib-693,#e36eb5,#ffffff,,pill
 vbb-vip-bus,694,,5-vbbvib-694,#70a4b8,#ffffff,,pill
-vbb-vip-bus,695,,5-vbbvib-695,#bf2a4f,#bf2a4f,,pill
+vbb-vip-bus,695,,5-vbbvib-695,#bf2a4f,#ffffff,,pill
 vbb-vip-bus,696,,5-vbbvib-696,#eb2d4c,#ffffff,,pill
 vbb-vip-bus,697,,5-vbbvib-697,#772382,#ffffff,,pill
 vbb-vip-bus,698,,5-vbbvib-698,#117b40,#ffffff,,pill
 vbb-vip-bus,699,,5-vbbvib-699,#d9992f,#ffffff,,pill
-vbb-vip-bus,X5,,5-vbbvib-x5,#ffffff,#b167b3,#b167b3,pill
+vbb-vip-bus,X5,,5-vbbvib-x5,#f2e6f1,#b167b3,#b167b3,pill
 vbb-vip-bus,X15,,5-vbbvib-x15,#ffffff,#49c07d,#49c07d,pill
 vbb-vip-bus,N14,,5-vbbvib-n14,#ffa32b,#ffffff,,pill
 vbb-vip-bus,N15,,5-vbbvib-n15,#ff7322,#ffffff,,pill
@@ -1338,7 +1338,7 @@ vbb-vip-tram,92,,8-vbbvit-92,#024890,#ffffff,,rectangle
 vbb-vip-tram,93,,8-vbbvit-93,#ff7322,#ffffff,,rectangle
 vbb-vip-tram,94,,8-vbbvit-94,#89969e,#ffffff,,rectangle
 vbb-vip-tram,96,,8-vbbvit-96,#00b098,#ffffff,,rectangle
-vbb-vip-tram,98,,8-vbbvit-98,#ffffff,#009edd,#009edd,rectangle
+vbb-vip-tram,98,,8-vbbvit-98,#daedf9,#009edd,#009edd,rectangle
 vbb-vip-tram,99,,8-vbbvit-99,#5fbf49,#ffffff,,rectangle
 vbg,RB 1,vogtlandbahn-die-landerbahn-gmbh-dlb,3-rd-rb1,#e30613,#ffffff,,rectangle-rounded-corner
 vbg,RB 2,vogtlandbahn-die-landerbahn-gmbh-dlb,3-rd-rb2,#0067b0,#ffffff,,rectangle-rounded-corner
diff --git a/validation/check.php b/validation/check.php
index e5c41f3..0dddaa9 100644
--- a/validation/check.php
+++ b/validation/check.php
@@ -47,6 +47,14 @@
     $i++;
 }
 
+
+echo "Checking that the background color isn't the text color" . PHP_EOL;
+$i = 2;
+foreach ($csv as $line) {
+    text_color_differs_background($line, $i);
+    $i++;
+}
+
 $sources = json_decode(file_get_contents("../sources.json"), true);
 $opSources = array_map(fn($op) => $op["shortOperatorName"], $sources);
 echo "Checking that operators are present in sources.json" . PHP_EOL;
diff --git a/validation/common.php b/validation/common.php
index 8b1cc17..6f7d614 100644
--- a/validation/common.php
+++ b/validation/common.php
@@ -21,8 +21,16 @@ function valid_shape($line, $i) {
 
 function valid_hex_color($line, $i, $key) {
     $color = $line[$key];
-    
+
     if (!(strlen($color) == 7 && ctype_xdigit(substr($color, 1)) && $color[0] === "#")) {
         throw new Error("bad $key \"$color\" does not follow #<6 digit hex color> in row $i");
     }
-}
\ No newline at end of file
+}
+
+function text_color_differs_background($line, $i) {
+    $textColor = $line["textColor"];
+    $backgroundColor = $line["backgroundColor"];
+    if ($textColor === $backgroundColor) {
+        throw new Error("bad color combination: text color \"$textColor\" may not be background color \"$backgroundColor\" in row $i");
+    }
+}
diff --git a/validation/test.php b/validation/test.php
index 38da0d3..072215a 100644
--- a/validation/test.php
+++ b/validation/test.php
@@ -86,6 +86,17 @@ function test_throws(string $name, callable $test_case) {
     valid_hex_color(["test_key" => "abcdefg"], 5, "test_key");
 });
 
+/**
+ * text_color_differs_background
+ */
+test_ok("text_color_differs_background for different colors", function() {
+    text_color_differs_background(["textColor" => "#ffffff", "backgroundColor" => "#000000"], 1);
+});
+test_throws("text_color_differs_background with the same data", function() {
+    $black = "#000000";
+    text_color_differs_background(["textColor" => $black, "backgroundColor" => $black], 2);
+});
+
 /**
  * End of file
  */