I've been enjoying the series. Of course there are little inconsistencies that people like us will notice, but the average viewer will be none the wiser. I think it's good that a documentary about the railways is being shown and people are getting an insight into what a complex system it actually is.
One thing I'm not sure about (and this isn't a criticism, it's more of a question) During the delays, when the staff were communicating to the customers, why didn't they put more of an emphasis that the delays were necessary for safety reasons. If I was one of the stranded people, I'd probably feel a little better if I knew that the delay was to ensure my safety and that it wouldn't be safe to travel until the fault was fixed. There didn't seem to be much emphasis on this. Is there any reason why not?