Others did use lower quadrant signals in the past including the LBSCR, the LSWR, the LNWR, the GNR and the NER - the signals on the NYMR are the North Eastern Railway type. I believe that after grouping in 1923, the LMS, LNER & SR all favoured upper quadrant, but some of the older signals survived for a long time if there was no need to replace them.
As for Heartbeat, I'm sure it's a bit of misunderstanding or artistic license for dramatic effect, although I often wonder if the Railway's representatives point out the inaccuracies and get told to mind their own business by the film company!
And I'm sure that stealing a locomotive is a much worse misdemeaner than passing a signal at danger but perhaps their conscience kicked in & thought they need to observe the rules of the road!
Tony
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