Ah! Obscure Pennsy electric motors! One of my favorite subjects!
The R1 (4-8-4) was a prototype passenger motor designed concurrently with the prototype GG1. It was not chosen for continued production.
The DD2 (4-4-0+0-4-4) was a prototype freight motor designed in the late 30's for the projected, but never built, Pittsburgh extension of the electrification. It too was not duplicated.