Table:
0
A
B
C
D
E
1
Identity
Builder
Built
Wheel Arrangement
Notes
2
50 Sutton (originally Whitechapel)
Brighton Works
1876
0-6-0T
Under overhaul (2011-08-15)
3
47493
Vulcan Foundry
1927
0-6-0T
Operational (2011-01-19)
4
68077
Andrew Barclay
1947
0-6-0ST
Under overhaul (2006-09-06)
5
2315 Lady Ingrid
Andrew Barclay
1951
0-4-0ST
Awaiting Boiler Overhaul (2009-9-28)
6
3135 Spartan
Fablok, Chrzanów
1953
0-6-0T
In service (2010-12-11)
7
Fonmon
Peckett
1924
0-6-0ST
Awaiting major overhaul (2009-09-28)
8
No.57 Samson
RSH
1950
0-6-0ST
Stored (2008-01-22)
9
Ugly
RSH
1950
0-6-0ST
Operational (2011-11-11)
10
North Downs No. 3
RSH
1955
0-6-0T
Under overhaul (2002-09-12)
11
No. 10 Topham
Bagnall
1922
0-6-0ST
Awaiting overhaul (2002-09-12)

Questions and formulas:
Question: What is the identity of the brighton works built train?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="brighton works"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E11,B2:B11="brighton works"),1))
Level: medium