Index: base.tab
===================================================================
--- base.tab	(revisión: 10014)
+++ base.tab	(copia de trabajo)
@@ -4092,6 +4092,10 @@
 name=Absolute times
 note=absolute departure time instead relativein departure board
 -
+obj=program_text
+name=The slope is not high enough!
+note=Shown when building a tunnel in a half-slope
+-
 
 #obj=help_text
 #name=Lower values mean more local sounds
Index: trunk/simtool.cc
===================================================================
--- trunk/simtool.cc	(revisión: 10014)
+++ trunk/simtool.cc	(copia de trabajo)
@@ -2951,9 +2951,14 @@
 				win_set_static_tooltip( translator::translate("No suitable ground!") );
 
 				slope_t::type sl = gr->get_grund_hang();
-				if(  sl == slope_t::flat  ||  !slope_t::is_way( sl )  ||  (env_t::pak_height_conversion_factor == 1  &&  !is_one_high(sl))  ||  (env_t::pak_height_conversion_factor == 2  &&  is_one_high(sl))  ) {
+				if(  sl == slope_t::flat  ||  !slope_t::is_way( sl ) ) {
 					// cannot start a tunnel here, wrong slope
 					return "";
+				} 
+
+				if( (env_t::pak_height_conversion_factor == 1  &&  !is_one_high(sl))  ||  (env_t::pak_height_conversion_factor == 2  &&  is_one_high(sl))  ) {
+					win_set_static_tooltip( translator::translate("The slope is not high enough!") );
+					return "";
 				}
 
 				const tunnel_desc_t *desc = tunnel_builder_t::get_desc(default_param);