Baldwin DR-12-8-1500/2
Original buyers
Table:
Railroad
Quantity
Road numbers
Notes

Union Pacific Railroad
2
998-999
Never sold

Baldwin Locomotive Works (demonstrators)
2
6000 A–B
Not sold (Original UP 998-999)

Ferrocarriles Nacionales de México
14
6400–6413

Pennsylvania Railroad
24
5823A1,2–5834A1,2
Renumbered 5811–5834 (not in order)

Seaboard Air Line
14
4500-4513

Observing the following table concerning 'Baldwin DR-12-8-1500/2' in the 'Original buyers' section, formulate a single-sentence overview of the highlighted cells and return it as JSON: {"answer": "YOUR ANSWER"}.