Scale displayed running costs by day length factor

src/engine.cpp

@@ -30,6 +30,7 @@
 #include "company_base.h"
 #include "vehicle_func.h"
 #include "articulated_vehicles.h"
+#include "settings_type.h"
 #include "error.h"
 
 #include "table/strings.h"
@@ -277,6 +278,15 @@ uint Engine::DetermineCapacity(const Vehicle *v, uint16 *mail_capacity) const
 	return capacity;
 }
 
+/**
+ * Return display value of how much the running costs of this engine are.
+ * @return Yearly running cost of the engine.
+ */
+Money Engine::GetDisplayRunningCost() const
+{
+	return this->GetRunningCost() * _settings_game.economy.day_length_factor;
+}
+
 /**
  * Return how much the running costs of this engine are.
  * @return Yearly running cost of the engine.