*/

	if (_settings_game.vehicle.smoke_amount == 0 ||

			this->vehstatus & (VS_TRAIN_SLOWING | VS_STOPPED) ||

			this->cur_speed < 2) {

		return;

	}

	if (this->type == VEH_TRAIN) {

		const Train *t = Train::From(this);

		/* For trains, do not show any smoke when:

		 * - the train is reversing

		 * - is entering a station with an order to stop there and its speed is equal to maximum station entering speed

		 */

		if (HasBit(t->flags, VRF_REVERSING) ||

				(IsRailStationTile(t->tile) && t->IsFrontEngine() && t->current_order.ShouldStopAtStation(t, GetStationIndex(t->tile)) &&

				t->cur_speed >= t->Train::GetCurrentMaxSpeed())) {

			return;

		}

	}

	const Vehicle *v = this;

	do {

		int effect_offset = GB(v->vcache.cached_vis_effect, VE_OFFSET_START, VE_OFFSET_COUNT) - VE_OFFSET_CENTRE;

			case VE_TYPE_STEAM:

				/* Steam smoke - amount is gradually falling until vehicle reaches its maximum speed, after that it's normal.

				 * Details: while vehicle's current speed is gradually increasing, steam plumes' density decreases by one third each

				 * third of its maximum speed spectrum. Steam emission finally normalises at very close to vehicle's maximum speed.

				 * REGULATION:

				 * - instead of 1, 4 / 2^smoke_amount (max. 2) is used to provide sufficient regulation to steam puffs' amount. */

					CreateEffectVehicleRel(v, x, y, 10, EV_STEAM_SMOKE);

					sound = true;

				}

				break;

			case VE_TYPE_DIESEL: {

				 * - up to which speed a diesel vehicle is emitting smoke (with reduced/small setting only until 1/2 of max_speed),

				 * - in Chance16 - the last value is 512 / 2^smoke_amount (max. smoke when 128 = smoke_amount of 2). */

				int power_weight_effect = 0;

				if (v->type == VEH_TRAIN) {

					power_weight_effect = (32 >> (Train::From(this)->gcache.cached_power >> 10)) - (32 >> (Train::From(this)->gcache.cached_weight >> 9));

				}

					CreateEffectVehicleRel(v, x, y, 10, EV_DIESEL_SMOKE);

					sound = true;

				}

				break;

			}

				 * Details: Electric locomotives are usually at least twice as powerful as their diesel counterparts, so spark

				 * emissions are kept simple. Only when starting, creating huge force are sparks more likely to happen, but when

				 * reaching its max. speed, quarter by quarter of it, chance decreases untill the usuall 2,22% at train's top speed.

				 * REGULATION:

				 * - in Chance16 the last value is 360 / 2^smoke_amount (max. sparks when 90 = smoke_amount of 2). */

				if (GB(v->tick_counter, 0, 2) == 0 &&

					CreateEffectVehicleRel(v, x, y, 10, EV_ELECTRIC_SPARK);

					sound = true;

				}

				break;

			default: