Table:
0
A
B
C
D
E
F
G
1
Road number
Traction
Builder
Built
Service
Wheels
Weight
2
1
Steam
Sächsiche Maschinenfabrik
1901
1907–08
B
12.7 t
3
2
Steam
Henschel & Sohn
1907
1907–08
B
14.3 t
4
3
Steam
A. Borsig
1908
1908–18
B
13.8 t
5
4 "Odin"
Steam
Orenstein & Koppel
1908
1908–49
B
13 t
6
344 & 336
Steam
Baldwin Locomotive Works
1917
1918–65
C
24.7 t
7
1, 2, 3, 6, 7 & 8
Electric
AEG / Skabo
1911–18
1911–66
D
44 t
8
4 & 5
Electric
AEG/Skabo
1912
1912–56
B
23 t
9
9 & 10
Electric
Sécheron
1958
1958–91
Bo'Bo'
60 t
10
14 & 15
Electric
Per Kure / Thune
1922
1966–91
B'B'
61.3 t
11
20, 21 & 22
Diesel
Henschel-Werke
1961
1961–91
C
43.5 t

Questions and formulas:
Question: What type of wheels did the locomotive have that was built by Baldwin Locomotive Works?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,C1="baldwin locomotive works"),6))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G11,C2:C11="baldwin locomotive works"),6))
Level: medium