In fairness to
@coppercapped , a lot of people on here over-egg the "sparks effect"... if you didn't know anything about railways then reading the posts on here would give the impression that simply changing the power source of a train would suddenly attract thousands of new passengers.
And it's not just the "sparks effect", people similarly go on about this massive "untapped demand", as if increasing the capacity on any line is all you need to do to replicate Operation Princess.
Most of the lines where passenger numbers went up significantly at the time of electrification were a combination of
- increased frequencies
- longer trains
- more comfortable/ better quality trains (please not yet another debate about seats though - please!)
- a long period of disruption due to electrification meaning that there was an apparent jump in passenger numbers once the line re-gained an all-day/all-week service
- a time of economic boom, meaning more commuter demand (e.g. the market for travel into booming Leeds in the early '90s, when previously very few people would have commuted all the way from places like Ilkley/ Keighley)
...but now that frequencies have been pretty much maxed out at major termini, there's a lot less scope for more departures (e.g. the planned EMR timetable will see just the same number of St Pancras departures for Leicester since there's no capacity to increase the paths due to the squeeze of Thameslink), we certainly aren't living in times of much economic boom any more either!
I'm all for wide eyed optimism but I think that we need to be more realistic about the effects of changing fuel on passenger numbers - there are good reasons for electrification (better air quality, more sustainable, cheaper to run trains, potentially running a four coach electric train at less than the cost of a two coach diesel train) but we don't need to exaggerate. I'd love to consign "Sparks Effect" into the Forum's swear filter