IRM runs IC and CSSSB equipment with pans, although they do have to watch them at wire junctions.
The first reason I'd say doubtful for IRM is the length of a train set. The deepest barn is around 400 feet; an Acela trainset is over 600 feet in length. You could omit a few cars to get length down, but two power cars alone would take up 2/5ths of the available track in the longest barn... is it worth having two power cars, two coaches and a cafe car?...
The bigger problem will be overhead voltage. IRM runs 600V. Acela needs 12,000V. The IC cars ran on 1500V as did the CSSSB. Those cars can and do run on "half" voltage at IRM. Running Acela at 5% won't work, just as it won't work on the AEM-7 that IRM received two years ago, or the Virginian EF-4.
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