When German engineers check whether a structure will carry its loads, they do not calculate with the loads they expect. The standard DIN EN 1990, the basis of structural design, sets the factors. In the calculation, the dead loads are multiplied by 1.35 and the imposed loads by 1.5. The trade portal Baunetz Wissen explains the idea behind it with a quotient, γ. It divides the maximum load at which a part could fail by the permissible load. If γ equals 1, the safety reserve is missing. Only when γ is greater than 1 is there a calculated safety.
engineering
One Minute of Buffer
In the timetable of the German railway network, a Pufferzeit, buffer time, is a binding extra minute between two trains. It comes on top of the gap that is technically required. Deutsche Bahn says it is meant to stop delays from passing on to the following trains. It is being introduced route by route. DB also plans Joker-Gleise, joker tracks. A joker track is a platform track in a station that is kept free on purpose and may only be used when needed. The seven big hubs, Hamburg, Berlin, Hanover, Cologne, Frankfurt, Mannheim and Munich, count as heavily loaded. In March 2026, a news report described the problem plainly. Because buffers are missing, delays pass on to the following trains. In February 2026, the punctuality of DB long-distance trains was 59.4 percent.
The buffer minute is being added to a network where many hubs and main lines are overloaded.
The Archive That Fell
On 3 March 2009 the Historical Archive of the City of Cologne collapsed into the pit of a new subway station. Two young residents died. A court-appointed expert found the cause in a defect, a Fehlstelle, in an underground concrete wall. In 2005 workers had left a block of rock in the excavation. According to the indictment, they dug on anstatt das Hindernis zu melden, instead of reporting the obstacle. The criminal courts then examined each person’s duty of care one by one. Two construction managers were acquitted in 2018. The court found breaches of their duty of care but held that these had not caused the collapse. A senior site manager received one year on probation in 2019. The judge said the eindeutige Warnsignale, clear warning signs, in a construction record should have led him to check more closely. The Federal Court of Justice overturned the judgments in 2021. In 2024 the court provisionally closed the cases against the four remaining defendants, against payments of money. In 2020 the construction consortium agreed to pay the city 600 million euros. At the time, it still disputed the cause.
The Responsible Electrician
Many companies that run electrical installations are led by managers who are not electricians. A training guide on the verantwortliche Elektrofachkraft, the responsible electrical specialist, notes that such a manager kann die Fachverantwortung nicht übernehmen, cannot take on the technical responsibility. The company therefore appoints a qualified electrician to that role in writing. The role is based on the standard DIN VDE 1000-10. KomNet, the occupational safety advice service of North Rhine-Westphalia, explains what the appointment means. Eine verantwortliche Elektrofachkraft unterliegt hinsichtlich der Einhaltung der elektrotechnischen Sicherheitsmaßnahmen keinen fachlichen Weisungen. On electrical safety measures, she takes no technical instructions. Für die elektrische Sicherheit sind nur die verantwortlichen Elektrofachkräfte und nicht die ausschließlich disziplinarischen Vorgesetzten verantwortlich. Only the responsible electrical specialists are accountable for electrical safety. Superiors who manage her only as personnel are not. A model appointment certificate from the statutory accident insurer VBG states that she is hinsichtlich der fachlichen Aufgaben weisungsfrei, free of instructions in her technical tasks. Both the company management and the appointee sign it.
The Five Safety Rules
Before anyone works on an electrical installation in Germany, five steps come first. They are die fünf Sicherheitsregeln, the five safety rules, set out in the standard DIN VDE 0105-100 on the operation of electrical installations.
Freischalten — disconnect.
Gegen Wiedereinschalten sichern — secure against switching back on.
Spannungsfreiheit feststellen — verify that no voltage is present.
Erden und kurzschließen — earth and short-circuit.
Benachbarte, unter Spannung stehende Teile abdecken oder abschranken — cover or fence off nearby live parts.
The accident insurance institution for the electrical trades, BG ETEM, calls them the essential requirements for making a work site free of voltage and keeping it so for as long as the work lasts. Teaching material for electrical training in Hesse adds the order. A work site may be released only after the rules have been carried out from 1 to 5. Power may be switched back on only after they have been lifted in reverse order, from 5 to 1.
After the Ice Rink Collapsed
In January 2006 the roof of the ice rink in Bad Reichenhall, in Bavaria, collapsed. Fifteen people died, twelve of them children. The same year, the conference of German building ministers adopted first rules and guidance for checking the structural safety of buildings. In February 2010 the engineers’ association VDI published the guideline VDI 6200, Standsicherheit von Bauwerken – Regelmäßige Überprüfung, structural safety of buildings, regular inspection. Its introduction gives the reason. After a series of tragic building collapses in Europe early in 2006, the call for a technical rule could no longer be ignored. The guideline gives reference values for how often a building should be inspected. It contains checklists, practical instructions and evaluation criteria. One chapter covers the Bauwerksbuch Standsicherheit, a logbook of a building’s structural safety.
Emergency Power Within 15 Seconds
German hospitals must provide part of their electricity as a safety supply, under the standard DIN VDE 0100-710. If the grid fails or is disturbed, the emergency supply must take over within 15 seconds. The fuel stored for it must last at least 24 hours. In 2022, the state government of Mecklenburg-Western Pomerania was asked in parliament how long its hospitals could last in a long blackout. It answered that further measures, such as larger tanks, could make supply possible beyond 24 hours. It also said that it had no information about individual hospitals.
The Release Dossier
A supplier to the German car industry may not begin series deliveries until its parts pass the Produktionsprozess- und Produktfreigabe, the production process and product approval, set out in Volume 2 of the German Association of the Automotive Industry. The first samples must be made vollständig mit serienmäßigen Betriebsmitteln und unter serienmäßigen Bedingungen, fully with series tooling under series conditions. One supplier guideline lists what goes with them: an inspection report with the measured value for every dimension on the drawing, the process flow chart, the control plan, and the approval status of the whole supply chain. Erstmuster ohne Erstmusterdokumentation können nicht bearbeitet werden. First samples without first-sample documentation cannot be processed. Every change to the product or the process must go through the procedure again, at least inside the supplier’s own plant.
Stuttgart 21
Stuttgart 21, the new underground main station, sollte rund drei Milliarden Euro kosten und schon 2019 in Betrieb gehen. It was supposed to cost about three billion euros and open in 2019. In June 2026 representatives of Deutsche Bahn told the Bundestag transport committee that it would open at the end of 2031. The latest cost estimate is about 11.3 billion euros. The financing contract of 2009 had committed the project partners only up to a little over 4.5 billion euros. A court ruled that the railway must bear the extra costs alone.
Change Management by Design
Since 2005 the V-Modell XT has been the standard process model of the German federal government for developing and buying IT systems. Its core has only four modules that every project must use: project management, quality assurance, configuration management, and Problem- und Änderungsmanagement, problem and change management. A project that leaves out any of the four does not comply with the model.