diff --git a/src/build_vehicle_gui.cpp b/src/build_vehicle_gui.cpp
--- a/src/build_vehicle_gui.cpp
+++ b/src/build_vehicle_gui.cpp
@@ -479,7 +479,7 @@ static int DrawRailEnginePurchaseInfo(in
 	y += FONT_HEIGHT_NORMAL;
 
 	/* Max tractive effort - not applicable if old acceleration or maglev */
-	if (_settings_game.vehicle.train_acceleration_model != TAM_ORIGINAL && GetRailTypeInfo(rvi->railtype)->acceleration_type != 2) {
+	if (_settings_game.vehicle.train_acceleration_model != AM_ORIGINAL && GetRailTypeInfo(rvi->railtype)->acceleration_type != 2) {
 		SetDParam(0, e->GetDisplayMaxTractiveEffort());
 		DrawString(left, right, y, STR_PURCHASE_INFO_MAX_TE);
 		y += FONT_HEIGHT_NORMAL;
diff --git a/src/engine_gui.cpp b/src/engine_gui.cpp
--- a/src/engine_gui.cpp
+++ b/src/engine_gui.cpp
@@ -161,7 +161,7 @@ static StringID GetTrainEngineInfoString
 	} else {
 		SetDParam(5, CT_INVALID);
 	}
-	return (_settings_game.vehicle.train_acceleration_model != TAM_ORIGINAL && GetRailTypeInfo(e->u.rail.railtype)->acceleration_type != 2) ? STR_ENGINE_PREVIEW_COST_WEIGHT_SPEED_POWER_MAX_TE : STR_ENGINE_PREVIEW_COST_WEIGHT_SPEED_POWER;
+	return (_settings_game.vehicle.train_acceleration_model != AM_ORIGINAL && GetRailTypeInfo(e->u.rail.railtype)->acceleration_type != 2) ? STR_ENGINE_PREVIEW_COST_WEIGHT_SPEED_POWER_MAX_TE : STR_ENGINE_PREVIEW_COST_WEIGHT_SPEED_POWER;
 }
 
 static StringID GetAircraftEngineInfoString(const Engine *e)
diff --git a/src/train_cmd.cpp b/src/train_cmd.cpp
--- a/src/train_cmd.cpp
+++ b/src/train_cmd.cpp
@@ -392,7 +392,7 @@ int Train::GetCurveSpeedLimit() const
 	static const int absolute_max_speed = UINT16_MAX;
 	int max_speed = absolute_max_speed;
 
-	if (_settings_game.vehicle.train_acceleration_model == TAM_ORIGINAL) return max_speed;
+	if (_settings_game.vehicle.train_acceleration_model == AM_ORIGINAL) return max_speed;
 
 	int curvecount[2] = {0, 0};
 
@@ -1989,7 +1989,7 @@ CommandCost CmdReverseTrainDirection(Til
 			v->force_proceed = 0;
 			SetWindowDirty(WC_VEHICLE_VIEW, v->index);
 
-			if (_settings_game.vehicle.train_acceleration_model != TAM_ORIGINAL && v->cur_speed != 0) {
+			if (_settings_game.vehicle.train_acceleration_model != AM_ORIGINAL && v->cur_speed != 0) {
 				ToggleBit(v->flags, VRF_REVERSING);
 			} else {
 				v->cur_speed = 0;
@@ -2941,8 +2941,10 @@ int Train::UpdateSpeed()
 
 	switch (_settings_game.vehicle.train_acceleration_model) {
 		default: NOT_REACHED();
-		case TAM_ORIGINAL: accel = this->acceleration * (this->GetAccelerationStatus() == AS_BRAKE ? -4 : 2); break;
-		case TAM_REALISTIC:
+		case AM_ORIGINAL:
+			accel = this->acceleration * (this->GetAccelerationStatus() == AS_BRAKE ? -4 : 2);
+			break;
+		case AM_REALISTIC:
 			this->max_speed = this->GetCurrentMaxSpeed();
 			accel = this->GetAcceleration();
 			break;
@@ -3055,7 +3057,7 @@ static const RailtypeSlowdownParams _rai
 /** Modify the speed of the vehicle due to a change in altitude */
 static inline void AffectSpeedByZChange(Train *v, byte old_z)
 {
-	if (old_z == v->z_pos || _settings_game.vehicle.train_acceleration_model != TAM_ORIGINAL) return;
+	if (old_z == v->z_pos || _settings_game.vehicle.train_acceleration_model != AM_ORIGINAL) return;
 
 	const RailtypeSlowdownParams *rsp = &_railtype_slowdown[v->railtype];
 
@@ -3451,7 +3453,7 @@ static void TrainController(Train *v, Ve
 				update_signals_crossing = true;
 
 				if (chosen_dir != v->direction) {
-					if (prev == NULL && _settings_game.vehicle.train_acceleration_model == TAM_ORIGINAL) {
+					if (prev == NULL && _settings_game.vehicle.train_acceleration_model == AM_ORIGINAL) {
 						const RailtypeSlowdownParams *rsp = &_railtype_slowdown[v->railtype];
 						DirDiff diff = DirDifference(v->direction, chosen_dir);
 						v->cur_speed -= (diff == DIRDIFF_45RIGHT || diff == DIRDIFF_45LEFT ? rsp->small_turn : rsp->large_turn) * v->cur_speed >> 8;
diff --git a/src/vehicle_gui.cpp b/src/vehicle_gui.cpp
--- a/src/vehicle_gui.cpp
+++ b/src/vehicle_gui.cpp
@@ -1532,7 +1532,7 @@ struct VehicleDetailsWindow : Window {
 						SetDParam(1, Train::From(v)->tcache.cached_power);
 						SetDParam(0, Train::From(v)->tcache.cached_weight);
 						SetDParam(3, Train::From(v)->tcache.cached_max_te / 1000);
-						DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, y, (_settings_game.vehicle.train_acceleration_model != TAM_ORIGINAL && GetRailTypeInfo(Train::From(v)->railtype)->acceleration_type != 2) ?
+						DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, y, (_settings_game.vehicle.train_acceleration_model != AM_ORIGINAL && GetRailTypeInfo(Train::From(v)->railtype)->acceleration_type != 2) ?
 								STR_VEHICLE_INFO_WEIGHT_POWER_MAX_SPEED_MAX_TE : STR_VEHICLE_INFO_WEIGHT_POWER_MAX_SPEED);
 						break;
 
diff --git a/src/vehicle_type.h b/src/vehicle_type.h
--- a/src/vehicle_type.h
+++ b/src/vehicle_type.h
@@ -68,9 +68,10 @@ enum {
 	MAX_LENGTH_VEHICLE_NAME_PIXELS = 150, ///< The maximum length of a vehicle name in pixels
 };
 
-enum TrainAccelerationModel {
-	TAM_ORIGINAL,
-	TAM_REALISTIC,
+/** Vehicle acceleration models. */
+enum AccelerationModel {
+	AM_ORIGINAL,
+	AM_REALISTIC,
 };
 
 #endif /* VEHICLE_TYPE_H */