Salaries / incomes from various sources - very hard to find like for like comparisons across the years - before/after tax, individual/household, etc ... also very hard to compare train fares - I don't know how many people paid full fare in 1902; these days it's a minority.
Would have thought most people pay the full fare these days? Apart from season tickets and some on discount railcards.
Even less are aware of split ticketing.
Possibly because it's easier just to pay the full amount than searching and working out discounts, etc.
That may well depend on how you define a full fare because there are effectively three of them, anytime off peak and super off peak. Given the penal rates that
GWR▸ and others charge for non-regulated anytime fares I suspect the number of sales of those between
PLY» and
PAD» is relatively low, mainly bought by people who have specific appointments at the other end who have no option but to travel at a particular time.
In the two earlier years, 1902 and 1967, there was still a rigid pence per mile basis for calculating ordinary fares, so when using those tickets there would be no advantage in split ticketing. This may not be the case today.
A form of split ticketing could save money in 1967 and was practised by a friend of mine when going on our spotting outings because he wasn?t entitled to privilege tickets whilst I was. Day returns were generally only available for local journeys up to, say, 50 miles and to major destinations such as London, Bristol, Cardiff, Plymouth etc. When we wanted to go to Manchester for example, he would buy a day return from Bristol to Hereford and on arrival race to the booking office to buy a day return to Shrewsbury. At Shrewsbury he would repeat the process again and buy a day return to Manchester.
This was only possible even then because dwell times were much longer than they are today and, of course, in 1967 the only things that were on line were the trains we were using. I doubt whether it would have made much difference on a PLY to PAD journey in those days, but I can?t of course be certain of that.
I can?t speak for 1902 because I wasn?t around at the time but, as that was a time when there were no pensions to speak of and no paid holidays, leisure traffic over so long a distance would have been minimal. 1967 and 2020 are very different in that respect.