You need to be careful here, since the PRR's "Fleet of Modernism" used both a red and a maroon. Having said that, from the paint samples I did myself, Polyscale PRR Tuscan is very close to Accupaint Passenger Maroon, but lighter than Modelflex PRR Maroon. I don't have a sample of Polyscale PRR Maroon, but since the same paint manufacturers produce both colors, there may be some slight difference.
Edit: Polyscale PRR Tuscan comes very close to matching the PRRT&HS's reproduction of PRR Tuscan Red Passenger Enamel.