If MBTA, MNCR, NJT, and maybe MARC, and the NHSP line along with LIRR join forces to designs 1 DMU of 3 styles?
COACH, BAGGAGE/COACH, PRLOR/LOUNGE. All will have (LI plug your ears) Low platform traps. And all be capatabel with each other, and interchangeable. FRA/PTC compliment and floor hight for high platforms.
Truthfully they don't need to be "DM" due to the new emissions regulations. A DMU Making occasional moves in NYP won't be a major issue.
Just food for thought
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