Prototype: German Federal Railroad (DB) type Ai "Donnerbüchse / Thunder Box" standard design car. 1st class with enclosed crossover platforms.
Model: The car has a finely detailed frame with many separately applied parts. The car body has separate interior walls running lengthwise, complete interior details, separately applied roof vents, etc. The car has digital lighting installed. Minimum radius for operation 1,020 mm / 40-3/16". Length over the buffers 43.5 cm / 17-1/8".