3751,BNSF train is a hybrid of ATSF & BN (CB&Q/GN specifically) stuff.
Each road brought a Budd "Great Dome" to the deal. I know BN had a Budd-built business car, and so did the Santa Fe. I don't know how many are active right now.
The double-deckers were acquired by BN just before the merger.
FWIW, the fleet's home is now Topeka Shops. Prior to the merger, ATSF kept theirs in Argentine Yard, KC, KS, and BNSF kept theirs (including a small but excellent shop) in Murray Yard, Nortk Kansas City, MO.
Made life nice around here, since the KCS also keeps their train here half the year. Three business fleets in one town. Not bad.
Oh: BNSF now has some cars permanently at their DFW headquarters, and KCS has taken a page from that book, placing one of their old heavyweights under a trainshed at their new headquarters building in downtown KC.
John
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The City of Saint Louis (UP, 1967) is still my standard for passenger operations