BHP Newcastle 37 class
Class list

Locomotive
Builder's No.
Entered service
As Built Engine
Body Widened
Withdrawn
Notes
37
2121-001
13 Jul 1960
Cummins NHS 6
Not widened
16 Jun 1987
Scrapped
38
2121-001
18 Jul 1960
Cummins NHS 6
Not widened
30 Apr 1991
Scrapped
39
2121-003
20 Jul 1960
Cummins NHS 6
Not widened
30 Apr 1991
Scrapped
40
2121-004
15 Aug 1960
Cummins NHS 6
Not widened
1 Nov 1982
Scrapped
41
2121-005
18 Aug 1960
Cummins NHS 6
Not widened
30 Apr 1991
Scrapped
42
3456-006
24 Oct 1960
Cummins NHS 6
Mar 1967
2 Oct 1983
Preserved Richmond Vale Railway Museum
43
3456-007
24 Oct 1960
Cummins NHS 6
Jan 1968
?
Preserved Richmond Vale Railway Museum
44
3456-008
10 Nov 1960
Cummins NHS 6
Feb 1968
26 May 1983
Scrapped
45
3456-009
14 Nov 1960
Cummins NHS 6
Jan 1966
2 Jan 1982
Scrapped
46
3456-010
1 Dec 1960
Cummins NHS 6
Apr 1966
11 Jan 1982
Scrapped
47
3456-011
8 Dec 1960
Cummins NHS 6
Oct 1966
1 Jul 1991
Preserved Dorrigo Steam Railway & Museum
48
4970-012
22 Sep 1961
Rolls Royce C6TFL
Aug 1966
30 Sep 1999
Sold Manildra Group Dec 2002 as MM04
49
4970-013
29 Sep 1961
Rolls Royce C6TFL
Feb 1966
30 Sep 1999
Sold Loongana Lime Sep 2002
50
4970-014
14 Oct 1961
Rolls Royce C6TFL
Dec 1967
30 Sep 1999
Sold Loongana Lime Feb 2002
51
4970-015
3 Nov 1961
Rolls Royce C6TFL
Oct 1967
30 Sep 1999
Sold Manildra Group Dec 2002 as MM03
52
4970-016
14 Dec 1961
Rolls Royce C6TFL
Sep 1966
1 Jan 1988
Preserved Dorrigo Steam Railway & Museum
53
9211-018
16 Apr 1964
Rolls Royce C6TFL
Jun 1967
30 Sep 1999
Preserved Richmond Vale Railway Museum
54
3835-020
5 Jan 1966
Cummins NHS 6
built wide
30 Sep 1999
Preserved Richmond Vale Railway Museum
55
3275-051
8 Sep 1977
Cummins NT855L4
built wide
30 Sep 1999
Sold Junee Railway Workshop Jul 2002
56
2967-052
11 Nov 1977
Cummins NT855L4
Narrow body
1 Jun 1988
Scrapped
57
6606-182-057
13 Dec 1982
Cummins NT855L4
built wide
30 Sep 1999
Sold Junee Railway Workshop Jul 2002
58
6606-182-058
13 Apr 1983
Cummins NT855L4
built wide
30 Sep 1999
Sold Heggies Bulk Haul, Port Kembla 4 Oct 1999, renumbered HBL58, sold to Manildra Group

Question: When was that Cummins engine model discontinued?
Answer: The locos powered with Cummins NT855 engines were either scrapped or sold.