There used to be three K4s in the collection. The two Bachmann Spectrum models were sold. The BLI Paragon 2 model is still part of the collection. 

Manufacture: Bachmann Spectrum
Build Date: 2001-2002?
Prototype: PRR K4 Pacific (USA)
Retired (Sold, no longer part of collection.)

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Manufacture: Bachmann Spectrum
Build Date: 2006-2007?
Prototype: PRR K4 Pacific (USA)
Retired (Sold, no longer part of collection.)

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Manufacture: Broadway Limited Imports (BLI)
Build Date: 2013
Prototype: PRR K4 Pacific (USA)