Why Locomotives Refuse to Use Antifreeze

Why do diesel locomotives use water instead of antifreeze, even when freezing temperatures could destroy their engines? The answer involves cooling efficiency, engine protection, and a surprising danger hidden inside antifreeze itself. Most cars rely on antifreeze to survive winter. But for decades, many powerful diesel locomotives, including the EMD SD40-2, have used chemically treated water in their cooling systems. Why would railroad engineers make such a risky choice? In this video, we explore how diesel locomotive cooling systems work, why water can outperform glycol-based coolant in certain conditions, and what happens when antifreeze leaks into engine oil. You'll also discover how railroads prevent water from freezing, why some locomotives were historically left idling through cold nights, and how modern technologies help protect these massive engines without wasting as much fuel. We also examine why some newer locomotive designs can use antifreeze while older engines remain dependent on carefully treated water. Sometimes, the best engineering solution isn't the most obvious one. It's the one that balances performance, reliability, maintenance, and the real conditions a machine must survive. Subscribe to Simple Things for more fascinating explanations of the hidden engineering behind everyday machines, transportation, and technology. #DieselLocomotive #RailroadEngineering #SimpleThings --- Timestamp: 00:00 - intro 01:05 - How Water Became The Standard 02:26 - Why Water Works So Well In A Giant Engine 04:22 - The Hidden Danger Of Antifreeze 06:14 - Why Locomotives Can't Use Just Any Water 07:35 - What Happens When A Locomotive Freezes? 09:35 - Why Some Locomotives Finally Use AntiFreeze --- ✨ About Small Things Small Things is created by Sarah, Maez, and Hassan — a small team who loves exploring the hidden stories behind simple things and small things. 🤖 Disclaimer: We may use AI tools to support research and production, but every video is reviewed and edited by our team. We respect copyright, original work, and YouTube’s policies. Thank you for supporting us. 🙏 If you notice any issues, please contact us at [email protected] #smallthings #simplethings