I have now posted the entire “Railroad Activity since 1850” onto the web site at https://denversrailroads.com/Timeline.htm. You can find it on the reference>general reference information tab.

There are 153 events listed by date and by group. Groups include manufacture dates for 50/60s locos, complete trailer activities, fallen flag dates and name trains that ran through Denver. This should help anyone trying to create a prototype railroad in the 50-70s period.