How Europe's leading rail platform built incident response expertise with Uptime Labs.

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About Trainline

Trainline is Europe's leading independent rail platform, processing £5.9 billion in ticket sales annually across 45 countries. With millions of journeys depending on platform availability around the clock, the quality of Trainline's incident response is inseparable from the quality of their customer experience - which is why they invested in Uptime Labs.

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A forward-thinking approach to reliability

"We've been evolving how we think about incident response - not just as a process to maintain, but as a capability to continuously strengthen."

Soumya, Senior SRE, Trainline

Trainline treats incident response as a discipline to advance, not simply a process to maintain. As the platform scales across markets, rail operators and millions of customer journeys, the team has been deliberately reframing reliability as a capability to develop. In particular, they focused on improving the behavioural aspect of incident response, when managing managing multiple stakeholders.

That mindset comes with a willingness to look honestly at the gaps - and to act on them using a rigorous scientific approach.

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The challenge

Running a 24/7, multi-market platform placed a heavy load on individual Incident Commanders, while SRE and IM teams spread across geographies lacked a consistent baseline for response. Security incidents added a further layer of complexity on top.

These represent the typical challenges of operating high-performance critical infrastructure at scale. What set Trainline apart was the decision to get ahead of them by giving responders realistic skills development under pressure - without putting customers at risk.

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The solution

"What resonated with us was a simple idea: you don't build strong incident response capability by documenting what 'good' looks like. You build it by practising it."

Soumya, Senior SRE

Uptime Labs runs AI-driven incident simulations for Trainline's SREs, Incident Managers and Security Operations team. Drills are designed around scenarios Trainline actually sees in production, with a continuous feedback loop into the curriculum.

"One of the best things I've found with Uptime Labs is that they continuously ask for feedback. Not just whether they're doing a good job, but whether we'd like specific drills designed to help us manage incidents we actually see in our organisation. It feels like customised training built around your needs."

Sankalp Bartariya, Senior SRE

Responders practice the full incident: triage, comms, coordination and decision-making - with curveballs designed to mirror real production chaos. These drills are designed to build the behavioural and technical skills allowing effective incident response to complex incidents.  Consequently, Trainline is now rolling out Uptime Labs' Incident Essentials Program - a structured, self-service training pathway that gives every on-call engineer a consistent behavioural foundation in incident response, from impact assessment to escalation.

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The results

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Better questioning, calmer responders

Repeated practice under realistic pressure has changed how responders handle information in live incidents - they interrogate assumptions more and react less, staying calmer when it counts.

"The only way to navigate incidents is by asking questions and challenging assumptions. Earlier, whenever an engineer said something, we had the tendency to believe it immediately. Uptime Labs taught me not to accept every answer at face value. After Uptime Labs, I became calmer - I started asking more questions instead of immediately diving into dashboards."

Sangeetha Niranjan, SRE

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A material share of real-world capability

Even for experienced engineers, the simulations now account for a meaningful proportion of the practice they draw on during real incidents.

"If I've got good practice now, at least 30% of that comes from Uptime Labs, maybe more."

Jamie Buchanan, Principal SRE

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Preparedness that extends into Security

The same practice-based approach now reaches Trainline's Security Operations team, where faster, better-prepared responses directly limit customer impact.

"Being prepared is really important and helps reduce customer impact. If you look at security especially, seconds count. While a production platform issue will eventually get resolved, security incidents can be very different - the damage caused by a security incident can potentially last far longer. People being prepared for all sorts of incidents is a really, really good thing to be doing."

Calum McDowell, Security Operations Lead

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Why it works for Trainline

• Realistic enough to matter. Simulations behave like Trainline's real systems and stakeholders, so the practice transfers into live incidents.

• Customised to their world. Drills are co-designed around the incident patterns Trainline actually sees.

• Built around the human factor. Responders consistently call out the relationship with the Uptime Labs team as a reason they look forward to training, and improvement is tied to their previous drills.

• One standard across teams and time zones. Whether the responder is in London or offshore, they practise the same scenarios to the same standard.

• Grounded in the science of how expertise actually develops. Uptime Labs' methodology is rooted in Cognitive Systems Engineering (CSE) - the discipline that studies how people think, decide, and adapt in complex, high-pressure environments. As John Allspaw of Adaptive Capacity Labs has written, CSE reveals that expertise in complex systems isn't transferred through documentation or instruction alone. Instead, emerges through repeated exposure to realistic, varied situations that force practitioners to build genuine adaptive capacity. Simulation-based practice works because it changes what people do, not just what they know.

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"The impact has been tangible. We're seeing stronger coordination, clearer decision-making and greater confidence across engineering and incident leadership teams. Most importantly, it's helping us continue building a more proactive and resilient reliability culture at Trainline."

Soumya, Senior SRE, Trainline

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Building on their momentum, Trainline continues to roll out the programme across their broader engineering organisation - cementing behavioural change at scale and pushing the industry curve in the process.