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For new followers, you may hear the term "loading gauge" and question the meaning. Will explain in a brief thread with this photo by @christofspieler at Roselle Park, N.J. a) the definition, and b) why it matters for passenger rail service. #trains #railroading
As opposed to track gauge, which measures the width between the rails (for which "standard gauge" is 4'8 1/2" for much of the world), loading gauge is the width of the widest part of the *train.* 
For passenger rail lines that are shared with freight operations, the wider loading gauge for the widest freight cars impacts passenger platforms, particularly high-level platforms, which need clearance for a bit of swaying for these cars, which tend to be wider than pax. coaches
