Thank you for your suggestions - I'll be sure to check those out.
The problem with finding UK train programs is that the services which are sold in the US are clumsy to use and limited in scope. For instance...
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It sounds cheap to pay $7 per month until you realize how much is missing and that you need to pay another $7 for each device type. Having BritBox on your phone, television, and computer costs $21 per month and we only get whatever content they specifically license for North America. If it's a BBC program they didn't bother to license or was part of a shared funding project it might show up on Discovery, Public Broadcasting, National Geogaphic, or nowhere at all. I've used iPlayer over VPN in the past but the last time I tried to use it nothing was working right. I've since read that iPlayer has apparently been discontinued and replaced with something else.