The German class 42.09 steam locomotive from era III was realized in 2005 as another interesting Marklin Z featuring the Franco-Crosti modification of a class 52 locomotive, a collaboration between two Italians included a system modification which made use of exhaust steam as well as exhaust gases incorporating a main boiler and secondary boiler to effectively utilize more of the energy produced by the BR 52. A second boiler/smoke gas pre-heater below the firebox was thus coupled with a chimneys attached to each side of the boiler, this system modification would be identified as Franco-Crosti boiler.

Attilio Franco and Dr. Piero Crosti designed the first such boiler nearly 20 years before class 42.09 was built . Modification to the wartime class 52 locomotive by Henschel in 1952 resulted in reclassification due to increased axle-weight resulting from the added 2 ton weight of modification.

Referred to as economisers (Abgasvorwarmer) the Franco-Crosti modification of 2 class 52 locos had a relatively brief service life of less than 10 years, but another 31 class 50’s were rebuilt by Henschel with Franco-Crosti boilers by the end of the 50’s.

Marklin’s release in 2005 of the 88041 was preceded by another Franco-Crosti locomotive (88040) for Insider Members in 2003. Painted in photo-grey for Henschel’s builder photographs 88040 with operating number 42 9000 is based on prototype retired in 1959 (Bingerbruck, Germany).

Painted and lettered for German Federal Railroad (DB) Marklin’s 88041 includes Wagner smoke deflectors and tub-style tender with operating number 42 9001 thus based on prototype built in 1952 and retired in 1960 (Oberlahnstein).

Siding: more than 7000 class 52 locomotives were built during World War II by 13 manufacturers throughout Europe