A steam locomotive always means a large volume of steam. The steam is not only discharged through the chimney, but the cylinders are drained with hot steam to. Even the first LGB garden railway locomotives had a built-in steam generator. They could be recognized by the letter D at the very end of the ordering number. Especially outdoors the smoke was barely visible. It took over 30 years until the Harz locomotive 99 7234 was manufactured and equipped with a powerful chuff-synchronized smoke generator from Massoth. As a fall novelty 2014 Massoth presented the cylinder steam add-on #8413901. A three-way valve distributes the steam to the chimney and the two cylinders. The appropriate steam sounds greatly increases the illusion of hard-working steam locomotives on their way to the Brocken, the Swiss alps or at the Rio Grande.