user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: the prr s2 was built by what locomotive builder? 
Knowledge Triplets: Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, g.1z3t21j59
Beep, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Southern Railway Ps-4 class
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, g.1219bl55
Baldwin DRS-6-4-1500, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Southern Pacific class MM-2
g.1z3t21j59, rail.locomotive_class.built_by, Baldwin Locomotive Works
NZR WJ class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Commonwealth Railways CA class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, JGR Class 8150
g.122qmj_w, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin 4-8+8-4-750/8-DE, rail.locomotive_class.built_by, Baldwin Locomotive Works
USRA Heavy Santa Fe, rail.locomotive_class.built_by, Baldwin Locomotive Works
Queensland A10 Baldwin class locomotive, rail.locomotive_class.built_by, Baldwin Locomotive Works
Little Joe, rail.locomotive_class.built_by, Baldwin Locomotive Works
Commonwealth Railways G class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Baldwin DRS-6-4-1500
Baldwin VO-1000, rail.locomotive_class.built_by, Baldwin Locomotive Works
PRR M1, rail.locomotive_class.built_by, Baldwin Locomotive Works
NZR N class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, N&W Class J
New South Wales C32 class locomotive, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, organization.organization.founders, Matthias W. Baldwin
Baldwin VO-660, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, NZR T class
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Southern Pacific class MC-4
PRR K5, rail.locomotive_class.built_by, Baldwin Locomotive Works
EAR 27 class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, NZR OA class
D&RGW K-36, rail.locomotive_class.built_by, Baldwin Locomotive Works
D&RGW K-37, rail.locomotive_class.built_by, Baldwin Locomotive Works
Southern Railway Ps-4 class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, MRWA D class
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, New Zealand AA class
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, D&RGW K-36
Southern Pacific class AC-8, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, PRR I1s
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Baldwin RS-4-TC
Southern Pacific class AC-10, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin DRS-6-4-1000, rail.locomotive_class.built_by, Baldwin Locomotive Works
Milwaukee Road class L2, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Southern Pacific class AC-7
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Milwaukee Road class L2
NZR UB class, rail.locomotive_class.built_by, Baldwin Locomotive Works
South African Class 15CA 4-8-2, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, South African Class 12B 4-8-2
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Queensland A10 Baldwin class locomotive
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, PRR M1
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Baldwin DS-4-4-660
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, USATC S118 Class
USRA Light Mikado, rail.locomotive_class.built_by, Baldwin Locomotive Works
PRR S2, rail.locomotive_builder.locomotive_classes_built, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, NZR WB class
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, NZR NA class
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Milwaukee Road class A2
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Southern Pacific class MC-2
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, NZR Q class
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, PRR S2
ATSF 3460 class, rail.locomotive_class.built_by, Baldwin Locomotive Works
PRR S2, rail.locomotive_class.built_by, Baldwin Locomotive Works
South African Class 16DA 4-6-2, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, NZR WJ class
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Baldwin DRS-4-4-1500
NZR BC class, rail.locomotive_class.built_by, Baldwin Locomotive Works
New South Wales Z23 class locomotive, rail.locomotive_class.built_by, Baldwin Locomotive Works
NZR T class, rail.locomotive_class.built_by, Baldwin Locomotive Works
PRR S2, rail.locomotive_class.introduced, 1944
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Baldwin RT-624
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, SP&S Class E-1
USRA 0-6-0, rail.locomotive_class.built_by, Baldwin Locomotive Works
Matthias W. Baldwin, organization.organization_founder.organizations_founded, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Baldwin DRS-6-4-750
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Delaware & Hudson 1205 and 1216
g.1z3t26j54, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin DR-4-4-15, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, NZR NC class
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, New South Wales C32 class locomotive
PRR K4s, rail.locomotive_class.built_by, Baldwin Locomotive Works
Southern Pacific class MC-2, rail.locomotive_class.built_by, Baldwin Locomotive Works
USRA 2-8-8-2, rail.locomotive_class.built_by, Baldwin Locomotive Works
Southern Pacific class AM-2, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, PRR T1
DHR B Class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Milwaukee Road class EP-3, rail.locomotive_class.built_by, Baldwin Locomotive Works
New Zealand AA class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, PRR N2sa
Southern Pacific class MC-6, rail.locomotive_class.built_by, Baldwin Locomotive Works
NZR OA class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, PRR E2c
Baldwin S-8, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, organization.organization.date_founded, 1831
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Baldwin DS-4-4-750
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, NZR WD class
Indian locomotive class WP, rail.locomotive_class.built_by, Baldwin Locomotive Works
JGR Class 7170, rail.locomotive_class.built_by, Baldwin Locomotive Works
Southern Pacific class AC-7, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, South African Class 15CA 4-8-2
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, NZR OB class
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Baldwin S-8
PRR T1, rail.locomotive_class.built_by, Baldwin Locomotive Works
PRR N2sa, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, USRA Light Mikado
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, South African Class 16D 4-6-2
Southern Pacific class MC-1, rail.locomotive_class.built_by, Baldwin Locomotive Works
Southern Pacific class MC-4, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, organization.organization.headquarters, m.0whywy0
New South Wales Z29 class locomotive, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Baldwin Class 10-12-D
D&RGW K-27, rail.locomotive_class.built_by, Baldwin Locomotive Works
Chesapeake and Ohio class M-1, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, USRA Light Santa Fe
Baldwin DS-4-4-750, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Southern Pacific class MC-6
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Southern Pacific class AC-10
Baldwin DRS-6-4-660NA, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, N&W J class
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Indian locomotive class WP
NZR OC class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, NS Class 1200
Southern Pacific class GS-1, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, USRA 0-8-0
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Baldwin DRS-4-4-1000
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, USRA Heavy Mikado
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, NZR BC class
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Union Railroad 0-10-2
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Southern Pacific class AC-12
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Commonwealth Railways CA class
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Little Joe
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, ATSF 3450 class
Baldwin DS-4-4-660, rail.locomotive_class.built_by, Baldwin Locomotive Works
N&W J class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Queensland AC16 class locomotive, rail.locomotive_class.built_by, Baldwin Locomotive Works
New South Wales Z21 class locomotive, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, PRR K4s
Baldwin RT-624, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, PRR B6
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Baldwin 4-8+8-4-750/8-DE
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, PRR H6
USRA Light Pacific, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Victorian Railways NA class
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Southern Pacific class MC-1
Southern Pacific class MM-2, rail.locomotive_class.built_by, Baldwin Locomotive Works
Indian locomotive class WG, rail.locomotive_class.built_by, Baldwin Locomotive Works
Southern Pacific class AC-4, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, DHR B Class
NZR O class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Delaware & Hudson 1205 and 1216, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin RS-4-TC, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, D&RGW K-37
NZR WD class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Southern Pacific class AC-11
Victorian Railways NA class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Southern Pacific class AC-11, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Class 10-12-D, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Baldwin DR-12-8-1500/2
South African Class 12B 4-8-2, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, NZR OC class
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, USATC S200 Class
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, g.1z3t26j54
NZR NC class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin DR-12-8-1500/2, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, NZR O class
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Chesapeake and Ohio class M-1
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, SP&S Class A2
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, USRA 2-8-8-2
Baldwin DRS-4-4-1000, rail.locomotive_class.built_by, Baldwin Locomotive Works
g.1219bl55, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Baldwin VO-660
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Baldwin VO-1000
Southern Pacific class AC-12, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Southern Pacific class AC-6
PRR H6, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, NZR UD class
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, New South Wales D59 class locomotive
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Southern Pacific class AC-8
NZR UD class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, g.122qmj_w
Palestine Railways H class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, New South Wales Z21 class locomotive
USRA 0-8-0, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, PRR K5
Baldwin DRS-6-6-1500, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Southern Pacific class AC-4
NZR Q class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Baldwin DRS-6-4-1000
Milwaukee Road class A2, rail.locomotive_class.built_by, Baldwin Locomotive Works
SP&S Class E-1, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Maine Central class O 4-6-0
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, USRA Heavy Santa Fe
MRWA D class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, PRR N1s
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Baldwin AS-416
N&W Class J, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, New South Wales Z29 class locomotive
NS Class 1200, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, PRR P5
ATSF 3450 class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0081-bea3
SP&S Class A2, rail.locomotive_class.built_by, Baldwin Locomotive Works
South African Class 16D 4-6-2, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Southern Pacific class AM-2
Baldwin DRS-4-4-1500, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, USRA Light Pacific
NZR WB class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Milwaukee Road class EP-3
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Southern Pacific class AC-5
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, New South Wales Z23 class locomotive
NZR OB class, rail.locomotive_class.built_by, Baldwin Locomotive Works
PRR N1s, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, PRR L1s
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, South African Class 16DA 4-6-2
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Commonwealth Railways G class
USRA Heavy Mikado, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, D&RGW K-27
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Southern Pacific class GS-1
Southern Pacific class AC-5, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Palestine Railways H class
USATC S200 Class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin DRS-6-4-750, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, ATSF 3460 class
JGR Class 8150, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, EAR 27 class
Baldwin AS-416, rail.locomotive_class.built_by, Baldwin Locomotive Works
New South Wales D59 class locomotive, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Baldwin DRS-6-4-660NA
PRR L1s, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Beep
Maine Central class O 4-6-0, rail.locomotive_class.built_by, Baldwin Locomotive Works
PRR B6, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Baldwin DR-4-4-15
NZR NA class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, USRA 0-6-0
Union Railroad 0-10-2, rail.locomotive_class.built_by, Baldwin Locomotive Works
PRR I1s, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, NZR N class
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, NZR UB class
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Indian locomotive class WG
USATC S118 Class, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Queensland AC16 class locomotive
Southern Pacific class AC-6, rail.locomotive_class.built_by, Baldwin Locomotive Works
USRA Light Santa Fe, rail.locomotive_class.built_by, Baldwin Locomotive Works
PRR E2c, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, Baldwin DRS-6-6-1500
PRR P5, rail.locomotive_class.built_by, Baldwin Locomotive Works
Baldwin Locomotive Works, rail.locomotive_builder.locomotive_classes_built, JGR Class 7170

Answer: Baldwin Locomotive Works