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Not sure about that - back in my days on the Chiltern lines each route had a two digit code in a similar manner to what you used to get on the Southern. Aylesbury - Marylebone via Amersham (all stations) was always '01.'
Looking at the Southern England route codes under Chiltern, route 37 doesn't exist and as there is no code for just Harrow-on-the-Hill it might be used for that instead as you say --- old post above --- --- new post below ---
Not sure about that - back in my days on the Chiltern lines each route had a two digit code in a similar manner to what you used to get on the Southern. Aylesbury - Marylebone via Amersham (all stations) was always '01.'