When Aldene Plan started in April, 1967, PRR Phila. - Penn Station, New York, N.Y. was $5.25, PRR Phila. - Penn Station, Newark, N.J. was $5.00. RDG Phila. - Penn Station, Newark, N.J. was $4.95, newspaper articles said that the new RDG fare to Newark was 30 cents less than the old fare to the ferry terminal in New York City, because the PATH Tubes charged 30 cents Newark - New York. So, just before Aldene Plan, PRR & RDG must have been the same price Phila. - New York. I don't know what the RDG charged Phila. - Newark before Alden, but after, they were 5 cents cheaper!
For many years starting from at least 1964, PRR had Ladies' Day round trips on Wednesdays and Thursdays after 9:30 a.m. at $4.50, Phila. - Penn Station, New York. Maybe in the past there had been a full fare round trip of $9.00 and this was half of it, it was certainly less that half of 2 $5.25 one-way tickets. There was even a half-fare version of this at $2.25 round trip with no sex restriction and good for ages under 16! The RDG had nothing to match.