As I've mentioned in other posts, I'd been struggling a lot since our move over whether to backdate to the early 1980s or continue with the IAIS, and I've reached a decision that would allow me to potentially do both if the pull to backdate becomes too strong at some point. Since this rural line saw very few changes between the 1980 loss of the RI and my May 2005 era, I can move back-and-forth between eras by doing little more than swapping out equipment and vehicles. However, since I'm much more of a fan of the UP than I am of the RI, I decided that a slight twist of history was in order to give the former a larger part to play.
While IAIS sessions would remain set in May 2005, my plan also allows for earlier-era sessions set in June 1984. In my alternate history, The UP's January 1980 announcement to acquire the MP and WP also included another "Pacific" - the Chicago, Rock Island & Pacific - bringing to reality the merger that was first announced in the 1960s and finally approved in the early 1970s before UP withdrew the offer due to the declining condition of the RI. In my world though, UP had a change of heart at The Rock's last moment and provided enough capital to allow RI to survive until the UP/MP/WP/RI merger was completed on January 1, 1983. 18 months later in my June 1984 era, UP would be running the 4th Sub with a mix of UP, MP, and WP power and cabooses that was common at the time, plus RI equipment. The first caboose-less train on UP would still be 4 months in the future, so the caboose operations that I've long missed from my early days of railfanning would play a big role.
Since the RI in this plan remained independent, and on a shoestring budget, right up until the 1983 merger day, the condition of the Chicago-Council Bluffs mainline of which the 4th Sub is a part would be a far cry from UP standards, and while rehab would begin in earnest further east, the 4th Sub would still see relatively modest speeds and low train counts in my June 1984 era. In fact, a typical operating session would likely look very much like an IAIS session, with the focus being on local grain elevator switching along with a handful of through trains. Given that, my six-track staging yard would be sufficient for UP traffic. In fact, the UP detours that I originally planned to run in 2005 IAIS sessions would be sold to help fund the purchase of 1980s UP/MP/WP/RI equipment, so I could keep equipment from both eras and railroads staged and ready to go. Try as I might, I've never been able to work up a fondness for modern safety cab units, so swapping those C44ACs and SD9043ACs for 1980s UP power and cabooses would be a major win for me.
This plan checks off a number of important boxes for me. It lets me model the UP, MP, and WP equipment I fondly recall from my favorite era of railroading, and while involving proto-freelancing, it allows me to take advantage of prototype IAIS car movement data to build realistic traffic patterns for the UP using their own equipment. Also, since RI equipment will still be common, and UP run-through power and cabooses on this portion of the RI were a regular occurrence before the 1980 shutdown, much of the equipment involved will be right at home.
Joe Atkinson
Modeling Iowa Interstate's 4th Sub, May 2005
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