Hello railway people, welcome to my new educational video about railways. Today, I will explain why we have 4 rails on bridges, but some other places as well.
This was something that bothered me few years back as well, especially as I was very interested in track design. Reason behind having 4 rails on bridges is very logical, to prevent train flipping over the bridge if derailment happens.
Note that not all bridges have them, depending on country, bridge position and similar. However, as a track designer I would always suggest to have them, as they can be efficient in reducing infrastructure damage or higher fatalities.
Let me know what you think about this in comment below. I would appreciate if you like, share or subscribe to my channel. This helps other people find out some interesting facts about railways too.
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