In-game depiction of the locomotive Grandpa (credit: Ashborne Games)
Grandpa (Dědula in original) is the first engine that is available to player (excluding tutorial engine). It's slow but with medium car capacity (7, 8 Upgraded) and lowest fuel consumption.
In-game description:
The Grandpa was one of the first types of Russian steam locomotives. During the First World War, it was often used on armoured trains because of its sturdy construction and small size. The Grandpa delivers balance between speed and power, making it a versatile choice.