The PRR applied circled keystone 5 stripe schemes to the flanks of a number of Baldwin diesels. To my knowledge circled keystones were not carried on the nose of any PRR power. The freight sharks (3 classes) were delivered in Dark Green Locomotive Enamel (DGLE) with 5 buff stripes. In the mid 1950’s they were repainted in the “standard” freight scheme carried by EMD, Alco, FM first generation diesel featuring a single narrow stripe.
The PRR’s BP20 passenger sharks featured a circle keystone 5 gold stripe DGLE scheme until repainted in a 5 buff stripe Tuscan red scheme beginning in mid 1952. Still later (around 1956) the railroad began to repaint the BP20’s in its new wide single stripe Tuscan Red passenger scheme.
The NS PRR Heritage scheme appears to be most strongly influenced by the Tuscan red passenger shark scheme. Differences between the Tuscan BP20 scheme in addition to the nose keystone circles include more closely spaced letters in P E N N S Y L V A N I A, and that the 5 stripes do not extend to the perimeter of the circle around the keystone.
I applaud the NS for going the Heritage paint scheme route - they all look great to me! Perhaps the railroad's intellectual property lawyers may have encouraged management to keep the road names alive.
Ed Rappe