On the Main Line, the MAS is 60mph. On the Bergen County line, the MAS is 70 mph. Southern Tier is 79 (Metro-North territory). Not sure what it is for the PVL, but the stops are so close together I doubt you reach above 50mph aside from the swamp to/from SEC.
On a side note, is there any line operating which requires the dual mode loco's? NJT is losing by using them as straight diesels (or electrics) as they guzzle fuel because of their weight. The first generation ALP's are showing their age, as I've been caught on the unfortunate end of them breaking down more than once since the summer before last.
DANGER - DO NOT GET OFF MOVING TRAIN