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Find a Wikipedia image that answers this question: What are placed on the front and back of trains in the NYC area so you can see if they're shuttles or metro trains?

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Represent the given Wikipedia image with related text information: R62A 42 St Shuttle An ad-wrapped train of three cars on the 42nd Street Shuttle.

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['images/WebQA/Train/30311762.jpg', 'images/WebQA/Train/30344492.jpg', 'images/WebQA/Train/30011772.jpg', 'images/WebQA/Train/30195143.jpg', 'images/WebQA/Train/30333686.jpg', 'images/WebQA/Train/30286410.jpg', 'images/WebQA/Train/30271236.jpg', 'images/WebQA/Train/30336152.jpg', 'images/WebQA/Train/30250914.jpg', 'images/WebQA/Train/30027297.jpg', 'images/WebQA/Train/30178913.jpg']