Hi Steve
Interesting about harmonic oscillation. That sounds pretty impressive. I've never come across it before - not surprising since I've only ever driven passenger trains which have two levels of vertical damping - primary (springs) and secondary (airbags), plus torsional dampers between the bogies and underframe.
And talking of lateness - on that hot day it took me 70 minutes to do a 9 minute trip. This was 30 minutes waiting for a down train to come towards me on the single line, then 40 to do the uppity trip. And nobody said a word of complaint, possibly because they were all mesmerised by the heat.
So in total it took 130 minutes to do the 50 minute trip. That's a record for me.
Anyway, perhaps I should stop banging on about our heat, what with with you freezing yer things off in Oz?
Cheers, BW