yes, I think many people don't think about the needs for long term planning for equipment replacement. Planning for equipment orders have to look 5, 10, 15 years out. The V3.1 Fleet Strategy Plan calls for ordering 100 Superliner replacements a year starting in FY 2018. (Which is after the 130 + options corridor bi-level cars would be delivered).If you look at the replacement dates, the Is will be hitting 40 years old at the time of replacement. That tends to be when things more or less start breaking down and the problems start adding up. Even with maintenance, reliability becomes a problem; 50 years is, as a rule, pushing it (though British Rail and its successors have gone past this limit with some of the Mark I cars, in general there was a push to replace those still in use during the late 90s and early 2000s). Reliability starts getting spotty and upkeep can get to be uneconomical. Also note that Amtrak plans to keep at least some Is in service for a little while thereafter as backups/spares.
If Amtrak places an order for 300 Superliner I & Parlor car replacements, at ~100 per year, with delivery starting in FY2018 (maybe), the last of the order would be delivered in FY2021 or FY2022. The Superliner Is were delivered from 1979 to 1981. Which would make the Superliner Is 41 to 43 years old by the time all the replacements were available for revenue service. Amtrak may not retire all the Superliner Is right away; might cherry pick from the units that are in better condition and recently overhauled to use for testing service expansion routes or for additional capacity in peak seasonal periods for a few years.
Another issue is attrition losses. Amtrak has had some significant attrition losses to the Superliner fleet. If one figures they lose 1 or 2 cars per year averaged over a long period, after 10 years, Amtrak may not have enough Superliners available to maintain the current service routes and frequencies.
Edit: spelling
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