Glad you mentioned the Lind Turn. Most yard jobs at Yardley use a GP-60B with one or two other units. Several sit around Parkwater for use as spares. Sometimes if the SPOPAS, SPOEVE, SPOLVW are over tonnage they will add a B-unit to those trains, and then they usually come back the next day or two. SPOPAS gets them the most often. The other day a grain train lost a unit leaving Hauser and stopped at Yardley and picked up a GP-60B to replace it.
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Also, if you are in the Spokane area, you might swing by Marshall and see if the FP-9 the W&I uses is there, and on to Cheney to see if the EWG's two tunnel motors, the ex-Utah Southern SD-40-2 or the Northern Plains (?) GP-35 are there. In Airway Heights, Western Rail, the locomotive dealer has an assortment of units behind the fence. Also in Cheney, you might see if the NP depot is still standing--it is to be torn down any time now.