![Metro tube train: doors open (green light) before doors closing (red light). Centraal Station Line 53 to Gaasperplas. Amsterdam Stock Photo - Alamy Metro tube train: doors open (green light) before doors closing (red light). Centraal Station Line 53 to Gaasperplas. Amsterdam Stock Photo - Alamy](https://c8.alamy.com/comp/FF3YYX/metro-tube-train-doors-open-green-light-before-doors-closing-red-light-FF3YYX.jpg)
Metro tube train: doors open (green light) before doors closing (red light). Centraal Station Line 53 to Gaasperplas. Amsterdam Stock Photo - Alamy
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