diff --git a/src/build_vehicle_gui.cpp b/src/build_vehicle_gui.cpp
index 16e5d75ad3..09ac34f811 100644
--- a/src/build_vehicle_gui.cpp
+++ b/src/build_vehicle_gui.cpp
@@ -790,6 +790,8 @@ static StringID GetRunningCostString()
 {
 	if (EconTime::UsingWallclockUnits()) {
 		return STR_PURCHASE_INFO_RUNNINGCOST_PERIOD;
+	} else if (DayLengthFactor() > 1) {
+		return STR_PURCHASE_INFO_RUNNINGCOST_ORIG_YEAR;
 	} else {
 		return STR_PURCHASE_INFO_RUNNINGCOST_YEAR;
 	}
diff --git a/src/engine_gui.cpp b/src/engine_gui.cpp
index 967874d75a..8b7a0e896f 100644
--- a/src/engine_gui.cpp
+++ b/src/engine_gui.cpp
@@ -206,6 +206,8 @@ static StringID GetRunningCostString()
 {
 	if (EconTime::UsingWallclockUnits()) {
 		return STR_ENGINE_PREVIEW_RUNCOST_PERIOD;
+	} else if (DayLengthFactor() > 1) {
+		return STR_ENGINE_PREVIEW_RUNCOST_ORIG_YEAR;
 	} else {
 		return STR_ENGINE_PREVIEW_RUNCOST_YEAR;
 	}
diff --git a/src/lang/extra/english.txt b/src/lang/extra/english.txt
index 721f4d643f..310f634de9 100644
--- a/src/lang/extra/english.txt
+++ b/src/lang/extra/english.txt
@@ -1507,6 +1507,7 @@ STR_BUY_VEHICLE_TRAIN_LOCOMOTIVES                               :Locomotives and
 STR_BUY_VEHICLE_TRAIN_WAGONS                                    :Wagons
 
 STR_PURCHASE_INFO_DESIGNED                                      :{BLACK}Designed: {GOLD}{NUM}
+STR_PURCHASE_INFO_RUNNINGCOST_ORIG_YEAR                         :{BLACK}Running Cost: {GOLD}{CURRENCY_LONG}/original year
 
 STR_BUY_REFIT_VEHICLE_BUY_VEHICLE_BUTTON                        :{BLACK}Refit after buy
 STR_BUY_REFIT_VEHICLE_BUY_VEHICLE_TOOLTIP                       :{BLACK}Automatically refit the highlighted vehicle after buying to selected cargo type
@@ -1564,6 +1565,8 @@ STR_NEED_REPAIR                                                 :{ORANGE}Vehicle
 
 STR_CURRENT_STATUS                                              :{BLACK}Current status: {STRING3}
 
+STR_ENGINE_PREVIEW_RUNCOST_ORIG_YEAR                            :Running Cost: {CURRENCY_LONG}/original year
+
 STR_VEHICLE_INFO_TRAIN_LENGTH                                   :{BLACK}Train length {LTBLUE}{DECIMAL} tile{P "" s} {STRING4}
 STR_VEHICLE_INFO_WEIGHT_RATIOS                                  :{STRING1} {STRING1}
 STR_VEHICLE_INFO_POWER_WEIGHT_RATIO                             :{BLACK}Power / weight: {LTBLUE}{POWER_WEIGHT_RATIO}
@@ -1571,6 +1574,8 @@ STR_VEHICLE_INFO_TE_WEIGHT_RATIO                                :{BLACK}Max. T.E
 STR_VEHICLE_INFO_FULL_WEIGHT_WITH_RATIOS                        :{BLACK}Full weight: {LTBLUE}{WEIGHT_SHORT} {STRING4}
 STR_VEHICLE_INFO_MAX_SPEED_LOADED                               :{BLACK}Max. speed (full): {LTBLUE}{VELOCITY}
 
+STR_VEHICLE_INFO_AGE_RUNNING_COST_ORIG_YR                       :{BLACK}Age: {LTBLUE}{STRING2}{BLACK}   Running Cost: {LTBLUE}{CURRENCY_LONG}/original year
+
 STR_VEHICLE_INFO_PROFIT_THIS_YEAR_LAST_YEAR_LIFETIME            :{STRING2} (lifetime: {CURRENCY_LONG})
 
 STR_VEHICLE_INFO_GROUP                                          :{BLACK}Group: {LTBLUE}{GROUP}
diff --git a/src/vehicle_base.h b/src/vehicle_base.h
index 3c0d5ef40b..a9a98e87a1 100644
--- a/src/vehicle_base.h
+++ b/src/vehicle_base.h
@@ -693,7 +693,7 @@ public:
 	 * Gets the running cost of a vehicle  that can be sent into SetDParam for string processing.
 	 * @return the vehicle's running cost
 	 */
-	Money GetDisplayRunningCost() const { return (this->GetRunningCost() >> 8) * DayLengthFactor(); }
+	Money GetDisplayRunningCost() const { return this->GetRunningCost() >> 8; }
 
 	/**
 	 * Gets the profit vehicle had this year. It can be sent into SetDParam for string processing.
diff --git a/src/vehicle_gui.cpp b/src/vehicle_gui.cpp
index a532d43882..bae472c32a 100644
--- a/src/vehicle_gui.cpp
+++ b/src/vehicle_gui.cpp
@@ -3001,7 +3001,7 @@ struct VehicleDetailsWindow : Window {
 					dim = maxdim(dim, GetStringBoundingBox(STR_VEHICLE_INFO_WEIGHT_RATIOS));
 				}
 				SetDParam(0, STR_VEHICLE_INFO_AGE);
-				dim = maxdim(dim, GetStringBoundingBox(STR_VEHICLE_INFO_AGE_RUNNING_COST_YR));
+				dim = maxdim(dim, GetStringBoundingBox(this->GetRunningCostString()));
 				size->width = dim.width + padding.width;
 				break;
 			}
@@ -3102,6 +3102,17 @@ struct VehicleDetailsWindow : Window {
 		if (widget == WID_VD_CAPTION) SetDParam(0, Vehicle::Get(this->window_number)->index);
 	}
 
+	StringID GetRunningCostString() const
+	{
+		if (EconTime::UsingWallclockUnits()) {
+			return STR_VEHICLE_INFO_AGE_RUNNING_COST_PERIOD;
+		} else if (DayLengthFactor() > 1) {
+			return STR_VEHICLE_INFO_AGE_RUNNING_COST_ORIG_YR;
+		} else {
+			return STR_VEHICLE_INFO_AGE_RUNNING_COST_YR;
+		}
+	}
+
 	void DrawWidget(const Rect &r, WidgetID widget) const override
 	{
 		const Vehicle *v = Vehicle::Get(this->window_number);
@@ -3115,7 +3126,7 @@ struct VehicleDetailsWindow : Window {
 				SetDParam(0, (v->age + DAYS_IN_YEAR < v->max_age) ? STR_VEHICLE_INFO_AGE : STR_VEHICLE_INFO_AGE_RED);
 				SetDParam(2, DateDeltaToYearDelta(v->max_age));
 				SetDParam(3, v->GetDisplayRunningCost());
-				DrawString(tr, STR_VEHICLE_INFO_AGE_RUNNING_COST_YR);
+				DrawString(tr, this->GetRunningCostString());
 				tr.top += GetCharacterHeight(FS_NORMAL);
 
 				/* Draw max speed */