To answer the question put forth in the header of this post: Yes. There were other steam generator-equipped units on Lehigh Valley.
Alco-GE RS2's 210, 213, and 214 were equipped. 2nd 211, which came second-hand from the Pennsylvania RR, was a "hammerhead" -- an uncommon variant of the Alco-GE RS3 with full-height short hood, which contained a steam generator.
It does not appear that these units were commonly used on LV passenger trains, as there was an adequate number of Alco-GE PA1's to power the shrinking fleet of passenger trains, including engines receiving scheduled maintenance, under normal circumstances.
