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Amtrak's Northeast Corridor is still 25hz below the phase break on the Hell Gate bridge approach. I remember in college seeing E60's in Penn Station, and yes, their number boards and all had a noticeable flicker to them. HEP is 60Hz, but I suspect there's a strong 25hz harmonic riding on it because you can see a slight flicker on older Amfleet cars once you change from 60Hz to 25Hz power.
They convert it at a few places, notably Metuchen, NJ. I have an article on SEPTA's 25Hz converter at Wayne Junction - ASEA built it in the late 80's and it was quite an interesting beast. Even today, listen closely to a SEPTA regional train, and you can hear a slight rumbling as they pull out of the station.
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