Don't feel too bad. Until only a few years ago millions of people commuted in and out of London on machines like this.
Indeed. I used to get on one of these for an hour and 35 minutes each way, every day. For about 5 years. It's the main reason I work from home now.
The door handles were on the outside, so you had to drop the window to get out. Hours of fun watching poor tourists panic when they reached their stop.
The added attraction was the extra ventilation that the badly secured windows offered in winter. There's nothing quite like zero degrees screaming through the carriage at 60 mph. (I exaggerate - nothing reached 60 mph, even downhill with a following wind.)
By comparison, the current rolling stock into Charing Cross, Canon Street and Victoria is a pleasure, if a little hard on the arse.
The rolling stock through Kent on the Eurostar line into St Pancras is very comfy, if a tad busy**. But it's not stupidly more expensive than the slow train. Hey, guess what? Provide decent trains, a short enough journey, and a frequent enough service and the passengers will come.
In our cute, straw-chewing, rural ways, we still call them "the fast train" and "the slow train". You can take the yokel out of the sticks, but you can't.. something, something.
** ETA IN the rush hour. During the day it's fine.