With the "for transport [as opposed to strictly-railway] enthusiasts" wording -- there occurs to me, a fiction series about which I have previously posted on the Forums (thread
Railway Books Discussion, sub-forum
Memorabilia, Media and Publications): the "Swann Saga" by R.F Delderfield. This author is one of a fair number, my own attitude to whom can be described as "love / hate": for me, his writing style varies between good / competent, and hack-type-cringingly-awful; but I'll admit that he had some good ideas -- outstanding for me, this "Swann" caper of his.
Premise of the series: Mr. Swann, as a British Army officer in the historical episode of the Indian Mutiny: becomes in course of same -- precisely how, perhaps best not enquired into too closely -- seriously rich. Shortly after, he resigns from the Army; and returns to England and embarks on an unconventional commercial undertaking. Uses his wealth to start off a firm with the purpose of offering, Great-Britain-wide, horse-drawn freight transport by road; in ways which manage to do a modicum of competing with, and financially undercutting, the relatively new mode of rail-borne transport which is carrying almost everything before it. (These doings are freight-only: by circa 1860, the passenger stage-coach has to be reckoned dead and gone -- other than on Exmoor; until some twit there, inaugurates an ineffective and pointless two-foot-gauge rail line

...)
Our hero enjoys a fair amount of success in this endeavour -- roping in sundry equine-road-transport fellow-die-hards; challenging the near-supremacy, of what these stalwarts describe as "the gridiron", or "they bliddy tea-kettles". (The books also tell of a certain amount of co-operation to mutual benefit, between rail transport and Swann horse-drawn same.) I personally, re Delderfield's literary style: as above, find that his writing here as elsewhere, veers between OK, and squirm-inducingly dreadful -- but if one can endure the latter -- I reckon the Swann Saga's basic idea, rather splendid. With the general appeal of the "underdog" -- it would seem difficult for one to do other than cheer for this magnificent
loony eccentric and quixotic entrepreneur, and his project.
The series comprises three books: chronologically,
God Is An Englishman;
Theirs Was The Kingdom; and
Give Us This Day.