In the good dimension, the election of Ronald Reagan led to a Socialist Revolution in New York and by 2024 the revolutionaries had take control of Chicago, Boston, Minneapolis and DC and were actively electrifying the rail network across their territory and building trains back up as the dominant form of transit
Now you may be wondering, if it's the good dimension how did Reagan get elected and the simple answer is he lied to the American populace and manipulated them into not realizing he opposed the very things they by and large supported
Also the 70s were still a shitty decade for everyone involved in the good dimension