Back in high school, got to do some railfanning on the old PRR MP-54's. My father had a student who's father was an engineer on the Pennsy. He ran K-4's, some GG-1's but was nearing retirement and wanted a closer to home run. He ran MP-54 trips from Jersey Ave to Penn Station NY. I spent part of an afternoon and made a round trip with him in the cab. You wouldn't think, but those old cars can get up to high speeds with enough running room. Although they had no speedometers, the could easily do about 75+. I did ride them many times from Rahway commuting to Penn station in the sixties and seventies until the Arrow II and Arrow III's replaced them all. I also commuted many years on the Arrow cars from MetroPark and Rahway to Newark.
During the '70's I commuted from Rahway/Metropark to Newark. When I commuted from Rahway I usually saw a special express run of 8-10 ArrowII cars. This was a well know run since it was written about in some newspapers. I believe it originated from Trenton, made a stop at Princeton Junction and maybe New Brunswick. From there it ran flat out to Newark then New York. When it passed throught Rahway it was wide open and was probably going close to the century mark. I know that ArrowII and III's could easily cruise 85-90 mph and on fairly level track hit 100, I know, I've seen it done on more than one occasion. When I commuted out of MetroPark, I caught one of two trains. One was about a 7:40 am local train, the other was an express at about 8:00 am. I tried to catch the this one. The express stopped at Metropark and ran express to Newark, sometimes on the west bound express track. If the engineer didn't have to switch tracks, he ran wide open until the Elizabeth 'S' and wide open until Hunter. If we had to switch, he ran slower to Rahway (only about 75 max) slowed for the change and wide open to Elizabeth. He would arrive at Newark about the same time or just behind that 7:40 train. I eventually had to give up on this train and beacause parking at Metropark was filled up by this time. It was great while it lasted.
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Bob