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Message: <blockquote data-quote="egosbar" data-source="post: 317569" data-attributes="member: 19871">what focus mode are you in  , im only familiar with the d7100 but id say the 5200 be very similar , i shoot for action shots , 21 point focus with either continuous focus or in your case maybe 3d tracking if your camera has it would work well , ive had no problem following birds in flight tack sharp so a train should workif you practiced on the electric and the last shot lost focus and your on manual then maybe you had to re focus before the next train , chack your not o single focus point</blockquote>