Schroeter Traktoren
ST (Schroeter-Traktoren, English: Schroeter-Tractors) was a Dutch vehicle manufacturing company active between 1902 and 1959. Founded by Ferdinand Schroeter after the disbandment of the SMLF (Schroeter Metaal-en-Lood Fabriek, English: Schroeter Metal-and-Lead Factory), the company produced tractors, trucks, cars, military vehicles, and farm equipment. It operated as a key industrial asset of the Schroeter family during the Middenvader Era and became a central point of internal conflict that contributed to the family split.
Background
The Schroeter family is the fifth family of De Vrienden. The family is historically associated with agriculture, military leadership, and later industrial manufacturing. Across generations, Schroeter family members were active primarily in Germany and the Netherlands, with later presence in the United States.
Records trace the family back to the early 19th century. Early members were predominantly active as farmers and landholders, while some also served as high-ranking military officers. A condition affecting spinal fragility is consistent within the family. Despite this, family members frequently occupied physically demanding roles in agriculture and command positions within military structures.
Prior to the unification of Germany, Schroeter family members served in Prussian military formations. During the period of Nazi Germany, a large proportion of the family enlisted in the armed forces, including senior command positions. Military involvement continued until 1945, after which most family members withdrew from formal military service.
By the 1940s, parts of the family had relocated to the United States. These branches were primarily involved in agricultural operations and industrial support roles, maintaining ties to Europe despite geographic separation.
History
Background and foundation (1902)
After the closure of SMLF, Ferdinand Schroeter established Schroeter-Traktoren in 1902. Originally a farmer and machinist, he focused on producing durable machinery for small and medium farms.
The company’s first product was the Schedelmerg, a one-cylinder diesel tractor sold for 500 guilders. It was intended as a practical and affordable solution for farm work. Schroeter introduced additional prototypes early in the company’s existence, including the Ferdischreiter and the Trekmerg, an experimental electric tractor that used rear-wheel steering and a lead-weighted chassis.
Early development (1903–1918)
During the first decade after its founding, Schroeter-Traktoren transitioned from a small agricultural workshop into an organized manufacturing enterprise. Ferdinand Schroeter expanded the company’s facilities, introduced standardized assembly procedures, and began employing machinists and metalworkers on a permanent basis rather than seasonal contracts.
The company invested in improved casting techniques, in-house engine machining, and structured component storage. By the 1910s, production was no longer limited to tractors. Schroeter reorganized the workshop layout to allow parallel development of transport vehicles and passenger machines, marking the shift from a rural toolmaker to a diversified mechanical manufacturer. Contracts with municipalities and farming cooperatives strengthened the firm’s financial base and allowed gradual expansion of production capacity.
Interwar years (1919–1939)
Following the First World War, Ferdinand Schroeter focused on scaling production to meet agricultural reconstruction needs. He expanded factory space, formalized supplier agreements, and implemented stricter quality inspection protocols. Output increased steadily as the company positioned itself as a stable industrial supplier rather than a small regional producer.
During the 1920s, the firm broadened its technical capabilities to include reinforced chassis construction, armored plating experiments, and heavier drivetrain systems. This marked the company’s entry into defense-related engineering alongside its agricultural focus. Separate internal teams were formed for civilian and armored development, though both operated under centralized oversight.
By the late 1930s, Schroeter-Traktoren functioned as a mid-sized manufacturer with balanced production lines. Agricultural machinery remained the company’s economic foundation, while defense contracts provided strategic relevance. The dual focus contributed to internal tension within the Schroeter family, as debates intensified over whether long-term stability lay in farming equipment or military expansion.
Second World War (1939–1945)
During the Second World War, Schroeter-Traktoren operated under occupation constraints and material shortages. Production planning shifted toward military demand, with expanded use of reinforced chassis and armored components. Civilian output continued in limited quantities, but priority was given to contracts tied to wartime requirements.
The period intensified disagreements within the Schroeter family regarding control of production decisions and the balance between agricultural stability and defense work. These disputes did not resolve after the war and later became a central issue in internal arbitration.
The Middenvader commissions and the split (1949–1959)
The family split is formally associated with two internal arbitration processes known as the Middenvader Commissie of 1949 and 1959. These commissions were convened to address escalating conflict within the Schroeter family, primarily related to Schroeter-Traktoren.
In 1949, the first commission failed to produce a stable long-term settlement. The dispute resulted in a structural split of the industrial operation. One branch continued under the core Schroeter-Traktoren structure, while a separate branch formed Schroeter-Traktoren West in Rotterdam-West, focusing on consumer vehicles and smaller machinery. Rivalry between the factions increased during the 1950s, with repeated attempts at mediation.
In 1959, a second commission was convened to settle ownership and direction. The process collapsed without resolution, and tensions escalated further.
Assassination and dissolution (1959)
Several days after the conclusion of the 1959 commission, Ferdinand Schroeter was found dead at his farmhouse with multiple gunshot wounds. The killing is documented as the Assassination of Ferdinand Schroeter. Reports linked the incident to individuals associated with the Rotterdam-West faction.
Following Ferdinand Schroeter’s death, Schroeter-Traktoren was fully disbanded later in 1959 to prevent further escalation and the risk of armed conflict between family factions. A formal truce was signed stipulating that Schroeter-Traktoren would never be re-established.
Models
The company produced the following models:
| Model | Type | Introduction year | Description |
|---|---|---|---|
| Schedelmerg | Tractor | 1902 | One-cylinder diesel tractor designed for small farms. Sold for 500 guilders. |
| Ferdischreiter | Tractor | 1902 | Early agricultural tractor prototype developed during the company’s founding phase. |
| Stuwmerg | Passenger car | 1903 | First passenger vehicle produced by ST, marking entry into civilian transport manufacturing. |
| Knakmotor | Generator | 1904 | Agricultural generator unit used for farm-based mechanical power support. |
| Trekmerg | Electric tractor | 1905 | Experimental electric tractor with rear-wheel steering and lead-weighted chassis. |
| PLM.I | Truck | 1910 | Early light truck adopted by farmers and municipalities for goods transport. |
| PLM.II | Truck | 1914 | Reinforced successor to PLM.I with improved chassis durability. |
| Wervelwerker | Tractor | 1921 | Agricultural tractor used widely in post-war farm reconstruction. |
| M.Beschiet.I | Armored vehicle | 1921 | First armored vehicle prototype produced under ST military experimentation. |
| Mergtor | Tractor | 1922 | Mid-sized farm tractor used across Dutch agricultural regions. |
| PRM.I | Armored vehicle | 1925 | Early tracked armored platform forming the basis of the PRM series. |
| PM.I | Armored vehicle | 1927 | Heavy armored prototype emphasizing reinforced drivetrain systems. |
| TM27 | Truck | 1927 | Medium-duty truck designed for agricultural and industrial logistics. |
| TM28-D | Truck | 1928 | Diesel-powered truck variant with improved torque output. |
| TM29 | Truck | 1929 | Upgraded transport platform with extended load capacity. |
| PRM.II | Armored vehicle | 1929 | Second-generation PRM platform with reinforced armor plating. |
| Minimerg | Tractor | 1930 | Compact agricultural tractor for smaller landholdings. |
| PRM.III | Armored vehicle | 1932 | Third-generation tracked armored vehicle with structural refinements. |
| Perg | Passenger car | 1932 | Small civilian car introduced during interwar diversification. |
| PRM.IV | Armored vehicle | 1935 | Advanced tracked armored vehicle developed before wartime expansion. |
| Rib.I | Tractor | 1935 | Agricultural tractor featuring improved stability and torque distribution. |
| Cranium | Tractor | 1936 | Heavy-duty farm tractor designed for intensive soil work. |
| Rib.II | Tractor | 1937 | Updated Rib platform with reinforced mechanical components. |
| PoPa.39.II | Armored vehicle | 1939 | Pre-war armored vehicle platform entering wartime production. |
| DordringM.40.I | Armored vehicle | 1940 | Wartime armored vehicle emphasizing reinforced chassis and armor plating. |
| Rib.III-M | Tractor | 1940 | Limited civilian agricultural tractor produced during wartime. |
| PRM.V-A-SK | Armored vehicle | 1942 | Wartime tracked armored vehicle under expanded military contracts. |
| PRM.V-B-SSK | Armored vehicle | 1943 | Reinforced wartime armored variant with structural modifications. |
| SlaPa.I | Armored vehicle | 1943 | Late-war armored vehicle prototype. |
| PRM.VI-DB | Armored vehicle | 1945 | Post-war armored development platform prior to company dissolution. |
| PoPa.48.IV | Armored vehicle | 1948 | Final armored platform introduced during internal family conflict period. |
Post-split developments
Following the 1959 commission, most Schroeter industrial operations were dissolved. One notable exception was the automotive company founded in 1950 in Vriendendam by Lourens Schroeter together with his father, Schroeter Romeo. The company remained operational and became one of the few Schroeter-founded enterprises to survive the post-commission period.
Association with other principal families
Prior to and during the Middenvader Era, Schroeter family members maintained close relationships with the Noord family, Paap family, Van Hetten family, and Hoos family in Germany and the Netherlands. These relationships, formed through military, industrial, and administrative overlap, collectively became known as De Vrienden.