Here's a link to a 1981 FRA study, vol 2
Dual mode from catenary.
A phased study for the LA&SL is first , followed by a look at Harriburg-Pittsburg.
[
babel.hathitrust.org]
If you want to download, be a Hathi Library Trust Member, or REALLY want it and down load the pp one at a time
Dunno where I found v.1, a summary by Garret Corp. It has a simple dwg of a C-C locomotive
According to the 1 jan 1954 roster, NYC had 9 hump slugs, powered from one, sometimes 2, DES. Four GE traction motors did the work and provided 60,00-and up TE