Function CheckIfTrainNeedsService

src/train_cmd.cpp:4144–4179

* Check whether a train needs service, and if so, find a depot or service it. * @return v %Train to check. */

 * @return v %Train to check.
 */
static void CheckIfTrainNeedsService(Train *v)
{
	if (Company::Get(v->owner)->settings.vehicle.servint_trains == 0 || !v->NeedsAutomaticServicing()) return;
	if (v->IsChainInDepot()) {
		VehicleServiceInDepot(v);
		return;
	}

	uint max_penalty = _settings_game.pf.yapf.maximum_go_to_depot_penalty;

	FindDepotData tfdd = FindClosestTrainDepot(v, max_penalty);
	/* Only go to the depot if it is not too far out of our way. */
	if (tfdd.best_length == UINT_MAX || tfdd.best_length > max_penalty) {
		if (v->current_order.IsType(OT_GOTO_DEPOT)) {
			/* If we were already heading for a depot but it has
			 * suddenly moved farther away, we continue our normal
			 * schedule? */
			v->current_order.MakeDummy();
			SetWindowWidgetDirty(WC_VEHICLE_VIEW, v->index, WID_VV_START_STOP);
		}
		return;
	}

	DepotID depot = GetDepotIndex(tfdd.tile);

	if (v->current_order.IsType(OT_GOTO_DEPOT) &&
			v->current_order.GetDestination() != depot &&
			!Chance16(3, 16)) {
		return;
	}

	SetBit(v->gv_flags, GVF_SUPPRESS_IMPLICIT_ORDERS);
	v->current_order.MakeGoToDepot(depot, OrderDepotTypeFlag::Service, OrderNonStopFlag::NoIntermediate, OrderDepotActionFlag::NearestDepot);
	v->dest_tile = tfdd.tile;
	SetWindowWidgetDirty(WC_VEHICLE_VIEW, v->index, WID_VV_START_STOP);
}

/** Calendar day handler. */
void Train::OnNewCalendarDay()