There has been some discussion on Facebook about the two new Terriers with one person posing an interesting question, which loco would be better in terms of guarantee and long term spares availability?
I expect that Hornby will be building theirs for years whereas the Rails/Dapol version might be a limited run.
I couldn’t see anything on the Rails website about a guarantee. I’m not unduly worried about it myself as I have found that most of my N gauge Dapol locos have been very good if looked after properly.