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Well, this is from an old interoperation research for my Rīga. 4 is the loading gauge of metro and 6 is the loading gauge of commuter trains – they don't fit in tunnels. But commuter trains cannot be made narrower or other trains won't fit in heavy rail stations.pic.twitter.com/6OncpfOCYW
But the conclusion of the research was that it is worth to build bigger tunnels and have commuter trains run through them.
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