Through the History of Mrklin Catalog Title Pages.
The painting adorning this car shows the legendary class 01 before the background of a massive mountain as the locomotive enters a tunnel with an express train. Next to the locomotive is probably the most typical railroad signal the semaphore signal. It shows Hp 1, i.e. “Proceed”.

Prototype:Privately owned type Ibopqs refrigerator car with the title page of the Mrklin catalog from 1930.