Ridgefielder wrote:What qualifies as an "experiment"? Do you mean one-offs that ran in regular service briefly but weren't duplicated, or actual demonstrators?
Thinking in particular of the SPV-2000s in New Haven-Hartford-Springfield service.
The SPV's were CDOT-owned and were repurposed a couple different times--as Metro North shuttle trains, and as de-motorized Constitution Liner coaches for Shore Line East--by CDOT. I guess that's a gray area since those were state-owned lineage and Amtrak's ops-only involvement with those vehicles was a lot briefer than the vehicles' total operating lifespan in Connecticut.
But for list-fodder purposes it's not like there were so many new-equipment experiments total since '71 that the SPV's need any sort of asterisk because of intra-state use and ownership. There were still enough national future considerations to get Amtrak interested in shaking those things down. The common carbody lineage with the Metroliners and Amfleets would've provided attractive economy of scale for extending that equipment trial well beyond CT had they worked out alright. It just never got that far because they didn't work out. The reliability failures were so quick, immediate, and pervasive that they were D.O.A. as far as Amtrak was concerned.