Skoda-706D

Škoda 706D: The Forgotten Beginning of a Czechoslovak Trucking Legend

The Škoda 706D was one of the most important heavy trucks to emerge from pre-war Czechoslovakia, even though it is far less familiar today than the later Škoda 706R, 706RT and 706MT. Introduced at the end of the 1930s, the 706 family represented a major step in Škoda’s commercial-vehicle development, combining a substantial seven-ton payload with a large six-cylinder diesel engine and a conventional but robust chassis. The letter D is particularly interesting because it identified the long-frame version of the 706, developed to accommodate larger cargo bodies; contemporary and historical references also use 706D as the designation of the early production truck itself. In either interpretation, the vehicle belongs to the crucial first chapter of a model lineage that would ultimately remain associated with Czechoslovak trucks for almost half a century.

The story of the 706D is inseparable from the industrial circumstances of late-1930s Czechoslovakia. Škoda was already an established manufacturer of commercial vehicles, but the company needed a modern heavy truck capable of replacing older types and meeting the growing demand for diesel-powered road transport. The resulting 706 was a traditional machine by today’s standards, with a ladder frame, two rigid axles, rear-wheel drive and a conventional bonneted cab, yet its 8.6-litre diesel engine gave it the kind of torque and endurance expected from a serious heavy-duty vehicle. Production began in 1939 and continued only for a short period before the Second World War disrupted civilian production. Contemporary historical sources put the total number of original 706 vehicles at only a little over 400, making surviving examples exceptionally significant pieces of Czechoslovak automotive history.

The Origins of the Škoda 706D

A new seven-ton diesel truck

The model designation 706 followed the naming convention used by Škoda’s commercial-vehicle division. The first two digits indicated the approximate payload in metric quintals, while the final digit referred to the number of engine cylinders. Thus, 706 represented a truck in the seven-ton class powered by a six-cylinder engine. This system made the basic purpose of the vehicle immediately apparent to people familiar with Škoda’s product range. The new truck was intended to replace older types such as the Škoda 606 while also occupying the heavy end of the company’s road-truck range.

The engineering work was significantly influenced by Professor Ing. Oldřich Meduna, one of the important figures in Czechoslovak truck design. The resulting vehicle followed a conventional European heavy-truck formula, but conventional did not mean unsophisticated. The 706 employed a substantial ladder-type frame, leaf-sprung rigid axles and a diesel power unit developed specifically for heavy commercial service. The cab was positioned behind a long engine bonnet, giving the truck the unmistakable appearance of a late-1930s European lorry and providing considerably more visual separation from the cab-over designs that would become characteristic of Czechoslovak trucks decades later.

The long-frame 706D

Within the original 706 family there were several chassis configurations. The standard 706 was offered primarily as a platform or conventional flatbed truck, while the 706N used a lower frame intended particularly for bus bodies. The 706D was the long-frame version, with its wheelbase extended by approximately one metre to accommodate longer cargo bodies. There was also a 706ND, combining the low-frame concept with the extended chassis. The letter D is therefore associated with the Czech term dlouhý rám, meaning “long frame.”

This distinction is important because the 706D should not simply be regarded as a completely separate truck from the basic 706. It was part of a modular approach to commercial-vehicle construction in which one mechanical platform could serve several transport roles. A manufacturer could therefore offer a conventional cargo truck, a long-wheelbase version and low-frame chassis for passenger or specialist bodies without designing an entirely different vehicle for every application. That flexibility was particularly valuable at a time when commercial vehicles were frequently fitted with bodies by specialist coachbuilders.

The Engine That Powered the 706

An 8.6-litre six-cylinder diesel

The mechanical centerpiece of the Škoda 706D was its large 8,554 cm³ inline six-cylinder diesel engine. Historical sources give the engine’s bore and stroke as approximately 110 × 150 mm, producing around 81 kW, or 110 horsepower, at roughly 1,500 rpm. The engine used water cooling and four-stroke operation, with an indirect-injection combustion system incorporating a prechamber or swirl-chamber arrangement.

An output of 110 horsepower may appear modest when viewed from the perspective of modern heavy trucks, but it was substantial for a seven-ton road vehicle of the late 1930s. More important than headline horsepower was the engine’s ability to generate useful pulling power at relatively low engine speeds. Diesel technology was becoming increasingly important in European commercial transport because of its fuel economy and suitability for long working hours, and Škoda’s adoption of a large six-cylinder diesel placed the 706 firmly within that technological transition.

The engine also helped establish a mechanical character that would remain associated with later members of the 706 family. Although the later 706R would receive a much larger 11.8-litre engine, the basic philosophy remained recognizable: use a large, relatively slow-running diesel to provide dependable propulsion for a heavy chassis rather than attempting to extract high specific power from a small engine.

Chassis and Drivetrain

A traditional heavy-truck layout

Underneath its imposing body, the 706D was relatively straightforward. The truck used a ladder frame, two rigid axles and leaf-spring suspension. Only the rear axle was driven, making the vehicle a conventional 4×2 road truck rather than an off-road machine. This configuration was appropriate for its intended role, since the 706D was designed primarily for transporting substantial loads on established roads rather than crossing difficult terrain.

The five-speed manual transmission gave the driver a useful spread of ratios for working with the heavy load. Historical specifications generally list a five-forward-speed gearbox with reverse. The combination of a large diesel, manual transmission and rear-wheel drive was typical of serious commercial vehicles of the period, and the design emphasized durability and serviceability rather than driving convenience.

The suspension relied on conventional semi-elliptical leaf springs, another feature that would remain familiar to generations of truck drivers. Such a system was heavy and offered little of the sophistication associated with modern air suspension, but it was exceptionally appropriate for a working vehicle expected to carry large loads over imperfect roads. The simplicity of the arrangement also meant that repairs could be carried out without the specialized equipment required by modern suspension systems.

Performance on the Road

Built for carrying rather than speed

The Škoda 706D was not designed to be fast. Published specifications generally place its maximum speed at approximately 52 km/h, a figure that seems remarkably low today but was perfectly understandable for a heavily loaded truck of the late 1930s.

The important measurement was not acceleration or top speed but the ability to move a substantial payload reliably over the road network. A seven-ton truck traveling at 50 km/h could perform useful freight work, particularly when compared with earlier commercial vehicles whose petrol engines were often less economical and whose operating costs could be considerably higher.

The long-frame 706D was particularly suitable for large flatbed bodies. The extended wheelbase provided additional space for cargo while maintaining the fundamental mechanical architecture of the 706. This was an early example of the specialization that would become increasingly important in post-war commercial-vehicle production, where the same basic chassis could appear as a cargo truck, tipper, tanker, workshop vehicle or bus.

The Impact of the Second World War

Civilian production cut short

The 706D appeared at an unfortunate moment in European history. Its introduction coincided with the beginning of the Second World War, and the political and economic environment quickly made normal civilian truck production increasingly difficult. Škoda’s Mladá Boleslav operation became integrated into the wartime industrial system, while shortages of components and materials further constrained civilian manufacturing. Production of the original 706 continued only until the early 1940s, with historical sources generally placing the end around 1943. Approximately 426 examples are commonly cited.

Some of the final vehicles inevitably found their way into military service, while the factory itself was increasingly directed toward wartime requirements. As a result, the 706 never had the opportunity to achieve the commercial success that its engineering might otherwise have allowed. Instead, it became the foundation for a much more important post-war development.

The interruption was not the end of the 706 concept. Engineers had already accumulated valuable experience with the chassis, engine and drivetrain, and the basic design provided a starting point for reconstruction once peace returned. In this sense, the 706D became the ancestor of a family that would eventually dominate large sections of Czechoslovak road transport.

From 706D to 706R

The beginning of the famous “Barča”

After the war, Škoda significantly revised the truck, creating the Škoda 706R, with the R standing for rekonstruovaný, or reconstructed. Although the post-war vehicle looked familiar and retained the traditional bonneted layout, it represented a major technical development. Its diesel engine grew to approximately 11.8 litres, producing around 135 horsepower, and the truck’s payload and overall capabilities increased accordingly.

The 706R became much more famous than its pre-war predecessor. Its long bonnet led to the affectionate nickname “Barča”, while the vehicle became a common sight throughout post-war Czechoslovakia. Production subsequently moved between several industrial locations, including Avia in Letňany and later the factories that became associated with LIAZ. The 706R eventually provided the basis for further generations, culminating in the cab-over 706RT and later 706MT.

This lineage gives the original 706D its real historical significance. It was not an isolated truck but the starting point of a design family that evolved through changing political circumstances, manufacturing organizations and technical requirements. The famous Škoda 706 of the post-war decades therefore owes much of its existence to the relatively obscure machine introduced before the war.

Why the Škoda 706D Matters Today

A rare beginning to a famous truck family

For modern enthusiasts, the 706D can be easy to overlook. The better-known 706R has a stronger visual identity, while the 706RT “trambus” became one of the defining Czechoslovak trucks of the second half of the twentieth century. Yet from a historical perspective, the 706D is arguably one of the most interesting versions because it captures the moment when Škoda established the basic architecture that would influence its heavy trucks for decades.

The truck also represents the rapid development of diesel transportation during the interwar period. Its large six-cylinder engine, seven-ton payload and five-speed transmission demonstrate how far Czechoslovak commercial-vehicle engineering had progressed by the end of the 1930s. It was no experimental prototype or lightweight delivery vehicle; it was a genuine heavy-duty road truck designed for the demanding freight operations of its time.

The rarity of surviving vehicles adds another layer to its importance. With only a few hundred original 706s produced before wartime production ended, the 706D is considerably less common than its later descendants. Every surviving example therefore provides an opportunity to examine a crucial stage in the development of Czechoslovak heavy trucks.

Škoda 706D Technical Specifications

Because surviving documentation distinguishes between the basic 706 and the long-frame 706D, and because period specifications can vary according to body and chassis configuration, the following figures should be treated as representative specifications for the original 706 family and its long-frame D version rather than as measurements applicable to every individual truck. The designation and principal technical data are supported by historical automotive sources and museum material.

The Škoda 706D was therefore much more than an obscure pre-war lorry. It was the starting point of one of the longest-lived commercial-vehicle families in Czechoslovak history. Its seven-ton capacity, large six-cylinder diesel and robust rear-wheel-drive chassis reflected the requirements of its era, while the long-frame D configuration demonstrated an early understanding of the need to adapt one mechanical platform to different transport applications. The Second World War prevented the original truck from reaching its full potential, but its engineering survived in the post-war 706R and ultimately in the much later trucks produced under the Škoda and LIAZ names.

Seen from that perspective, the 706D deserves to be remembered not merely as an old Škoda truck but as the foundation stone of a remarkable Czechoslovak trucking dynasty. The later “Barča,” “trambus” and LIAZ-derived 706 variants became familiar across Central Europe and beyond, but their story began with a comparatively small production run of bonneted diesel trucks built in Mladá Boleslav on the eve of the Second World War. The 706D may have been overshadowed by its descendants, yet without its sturdy architecture and successful seven-ton concept, one of the most recognizable names in Czechoslovak truck history might never have developed at all.