diff --git a/sets/city/60198-cargo-train/slope-detection/index.md b/sets/city/60198-cargo-train/slope-detection/index.md
index 17df04f..cdb92c7 100644
--- a/sets/city/60198-cargo-train/slope-detection/index.md
+++ b/sets/city/60198-cargo-train/slope-detection/index.md
@@ -11,10 +11,17 @@ description:
     "Detect the slope of the track. This lets you determine where the train
      is on the circuit."
 building_instructions:
-    external: https://www.lego.com/en-us/service/buildinginstructions/60198
+    external:
+    - https://www.lego.com/cdn/product-assets/product.bi.core.pdf/6245902.pdf
+    - https://www.lego.com/cdn/product-assets/product.bi.core.pdf/6245905.pdf
+    - https://www.lego.com/cdn/product-assets/product.bi.core.pdf/6245917.pdf
+    - https://www.lego.com/cdn/product-assets/product.bi.core.pdf/6245924.pdf
+    - https://www.lego.com/cdn/product-assets/product.bi.core.pdf/6245926.pdf
+    - https://www.lego.com/cdn/product-assets/product.bi.core.pdf/6245931.pdf
+
 ---
 
-## Building instructions
+## Design modifications
 Build the train using the standard instructions. Mount the
 [tilt sensor][tiltsensor]
 horizontally in the train, with the cable side facing towards direction of