In October of that year the locomotive, hauled by its younger brother Merddin Emrys
Surely Merddin is LT's older brother (1879 vs 1886)?
Dont know who was responsible for that, but I think it might be from a bad read. Article starts with comment the "Second" loco, whilst the ME starts "third" loco, and that may have been cause. (LT was second Blodge build, but fourth DFairlie for FR, and therefore you are right).
The first paragraph is in rather desperate need of splitting up. It's pretty unreadable.