Sneak Peek footage from Season 4 of AMC's 'Old West' action drama series "Hell On Wheels", from the producers of "The Walking Dead" and "Mad Men":
"...Season 4 starts with the storyline of 'Naomi', pregnant after one night in the barn with 'Cullen' (Anson Mount) and Cullen marrying her out of a sense of honor..."
Siobhan Williams who played Naomi in Season 3 has been replaced by actress MacKenzie Porter.
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