Early Prototype Scheme
1934 PRR:
- Dark Green, block pinstriping, small number keystone
1934:
- #4899/#4800 only. (unit changed numbers in this scheme)
Developed by the PRR, this scheme predates the Loewy design. A similar design was used on the R1 experimental.
Late Prototype Scheme
- Dark Green, Wide 5 gold pinstripes and gold sans-serif Futura lettering, small number keystone
#4800 only, through at least 1937.
First to be based on the Loewy design, but would later be refined on production units.
Loewy Scheme
- Dark Green, 5 gold pinstripes and gold sans-serif Futura lettering, small number keystone
The scheme as Loewy envisioned it.
Feathered Scheme
 1937 PRR:
 1937 PRR:- Dark Green, 5 gold pinstripes feathered together and gold sans-serif Futura lettering, small number keystone
This may have been and experimental variation to try to avoid the problems of painting over the intake vents on the locomotive's sides.
Modified Loewy Scheme
 1941 PRR:
1941 PRR:- Dark Green, 5 gold pinstripes and gold serif Clarendon lettering, small PRR keystone
Most fans consider this an improvement on Loewy's conception. Why Pennsy decided to change is unclear. Most other locomotive types did wear serif lettering.
Modified Loewy Scheme in Red
 1952 PRR:
1952 PRR:- Tuscan Red, 5 gold pinstripes and gold serif Clarendon lettering, small PRR keystone
- #4908 - #4913
1953:
- #4876, #4856, #4857 and #4929
Broadband Scheme
 1955 PRR:
1955 PRR:- Dark Green, thick yellow stripe and larger yellow serif Roman lettering, large PRR keystone
This was the defacto GG1 scheme for the late 50's and early 60's.
Broadband Scheme in Red
- Tuscan Red, thick yellow stripe and larger yellow serif Roman lettering, large PRR keystone
- #4907 and #4916
Broadband Scheme – Congressional
 1955 PRR:
1955 PRR:- Silver, thick red stripe and larger black serif Roman lettering, large PRR keystone
- #4866, #4872 and #4880
Modified Loewy Scheme Holdover
 1968 PC:
1968 PC:- Dark Green, 5 gold pinstripes and gold serif Clarendon lettering, small white PC herald
PC, without money, usually just blanked out the previous owner and painted PC herald on instead. This only surviving five striper was painted over in PC black.
Broadband Scheme Holdover
 1968 PC:
1968 PC:- Dark Green, thick yellow stripe and larger yellow serif Roman lettering, small white PC herald
Another PC holdover. A few of these units may have also received white numbering as well.
Broadband Scheme Holdover in Red
 1968 PC:
1968 PC:- Tuscan Red, thick yellow stripe and larger yellow serif Roman lettering, small white PC herald
Another PC holdover.
American Railroads Centenial Scheme
 1969 PC:
1969 PC:- Blue, low yellow stripe yellow serif lettering, no herald
This one of a kind scheme celebrates the centenial of the driving of the golden spike in 1869.
Midnight Scheme
 ca. 1970 PC:
ca. 1970 PC:- Black, white block or serif lettering and large PC herald
PC's defacto scheme was about as coloful and appealing as the company itself.
Broadband Scheme Holdover
 1976 Conrail:
1976 Conrail:- Dark Green, single yellow stripe with CR instead of the keystone
Conrail's turn to paint over someone else's herald.
Midnight Scheme Holdover
 1976 Conrail:
1976 Conrail:- Black, white block lettering
Most units as inherited from PC.
Another Conrail paintover.
Bicentenial Scheme
 1976 Conrail:
1976 Conrail:- Red sides, blue hoods and Bicentenial markings
#4800 only.
Another one of kind scheme, this time for the US Bicentenial in 1976.
Conrail Blue Scheme 
 ca. 1978 Conrail:
ca. 1978 Conrail:- blue, white curved block text, large CR herald
#4800 only known unit.
Conrail's defacto scheme, applied to very few locos.
Broadband Scheme Holdover
 1971 Amtrak:
1971 Amtrak:- Dark Green, thick yellow stripe white block lettering
#929 at least retained thie PRR scheme into its Amtrak days.
Amtrak's turn to paint over a herald.
Midnight Scheme Holdover 
 1971 Amtrak:
1971 Amtrak:- Black, white block lettering
Most Amtrak units retained thier PC black.
Another Amtrak paintover.
Savings Bond Scheme 
 ?? Amtrak:
?? Amtrak:- Black, white block lettering, no Amtrak lettering
Most units retained thier PC black.
Yet another one of a kind. Amtrak gets to be a governmental billboard.
Amtrak 1 stripe Scheme 
 ca. 1975 Amtrak:
ca. 1975 Amtrak:- Silver with red hoods, thick blue stripe, black block lettering
#902, #905 (#4905), #906 (#4906), #909 (#4909), #924 (#4924), #926 (#4926) and #927 (#4927).
Amtrak's defacto scheme.
Broadband Scheme Holdover
- Black, white block lettering
#4875, #4879, #4881, #4882 and presumably the rest of the NJT units wore PC black.
Another NJT repaint. 
Special thanks for sources and drawings to:






 

