This has been an enjoyable read.
My backstory is an aural one and started in my early teens, probably about 1976, when I swapped bedrooms with my sister to the front of my parents' house, where I could see the railway line on the other side of the canal. The house was on the Lanark Road in Edinburgh, between Slateford and Kingsknowe on the Edinburgh-Carstairs line.
There were actually 2 specific services that ignited my interest in locomotives!
Around 23.55 every night as it was time for me to get off to sleep, the night sleeper train to Bristol (I think) with 11 or 12 mixed Mk1s and parcels van would rumble up the 1 in 96 from Slateford and clatter off towards Kingsknowe. Immediately after it had passed, a mixed goods train probably headed for Kingmoor would be released from Slateford junction and would begin thrashing its way up the hill, sometimes with a few overloads. On a warm balmy night in the summer with the windows open, I could hear the goods train pulling off from Slateford well over a mile away and hear it for a good few minutes as the noise built and built up the hill towards the house. Then followed the clunking and squeaking of the assortment of old wagons, slowly diminishing into the distance. Once both trains had passed it was time to go to sleep.
I think the sleeper was mostly a 47, and the goods train was either a pair of 25s or a 40 most nights with occasional pairs of 37s, and the difference in their engine noises really interested me, so I bought an Ian Allan book to find out what they were. And that was that.
And it's still the noise that I love to this day.
I changed at Crewe yesterday on my way home, and 68013 came into one of the southern platforms so I dragged my bag on wheels about 150m all the way down the platform just so I could hear it pulling away