diff -r d322c7fa3a22 -r 942b9b820006 src/vehicle_gui.cpp
--- a/src/vehicle_gui.cpp	Tue Jun 24 13:47:15 2008 +0000
+++ b/src/vehicle_gui.cpp	Tue Jun 24 13:49:13 2008 +0000
@@ -1309,7 +1309,7 @@
 
 				/* Add space for the cargo amount for each part. */
 				for (const Vehicle *u = v; u != NULL; u = u->Next()) {
-					height_extension += 11;
+					if (u->cargo_cap != 0) height_extension += 11;
 				}
 
 				ResizeWindow(this, 0, height_extension);