Grade Crossings Caltrain Pennensula Railroad
A level crossing is an intersection where a railway line crosses a road or path at the same level, as opposed to the railway line crossing over or under using an overpass or tunnel. [from wikipedia]
16th Street Grade Crossing
16th_Street_Grade_Crossing/Caltrain_16th_Street_Grade_Crossing_20191013_114312_C19_4391.jpg
16th Street Grade Crossing, San Francisco, Caltrain , Peninsula Railroad

Trains have a much larger mass relative to their braking capability, and thus a far longer braking distance than road vehicles. With rare exceptions, trains do not stop at level crossings and rely on vehicles and pedestrians to clear the tracks in advance.[from wikipedia]

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