Since the four PA's were used locomotives, when originally acquired from the Santa Fe in 1967, the decision was made to send them to Morrison-Knudsen of Boise, ID for complete rebuilding. There, the original ALCo 244 V-16 engines were replaced with brand new, reliable, and more powerful ALCo 251 V-12's. New stainless sheetmetal panels were fabricated for the carbodies, new electrical; the locos receiving COMPLETE stem to stern overhauls in preparation their new passenger assignments. In the process, they were reclassified as PA4's.
Here's D&H PA4 #17, a year or so after having been rebuilt by M-K. The black and red Morrison-Knudsen "builders plate" is visible just ahead of the side entry door.
And a closeup of the engineer's side of PA4 #18 "G.W. Hockaday" (still at the M-k Shops, prior to delivery) giving an even better view of the badge.
But I digress. The purpose of this entry was to talk about Penn Divisions Excursions after the PA's departure. The fan trips did continue, but they were now pulled by the Red-White & Blue Bicentennial painted GE U23b, and MK-rebuilt ALCo RS3u. Here they are, pulling the southbound. Image was taken from the top of EL's Starrucca Viaduct.