Of the original 239 SP/SSW units, 84 units were fitted with extended noses, 80 of those 84 units went to UP at merger (SP retired four units prior to the merger); the 80 units to UP include UP 8639-8654 (16 units), 8663-8673 (11 units), 8682-8702 (21 units), 8730-8750 (21 units), 8830-8832 (three units), and 8838-8845 (eight units); all 80 units were part of the original SP orders in 1974 and 1978-1979 (SP 8300-8341 and 8350-8391) for 84 units (42 pairs) that were equipped to operate in radio-controlled mid-train helper service; 14 units (ex SP/SSW 8300-8306 and 8350-8356) are fitted with 116-inch extended noses; 70 units (ex SP/SSW 8307-8341 and 8557-8391) are fitted with 123-inch extended noses.

c.

Renumbered to UP out of SP/SSW sequence due to different ownership and lease arrangements.

d.

All 231 units assigned UP 4369-4599 in September 1997, 66 units renumbered; assigned UP 8639-8869 in December 1999; 75 units renumbered (four refurbished and renumbered to 2866 series), 95 units retired prior to being renumbered to UP numbers; 62 units were refurbished in 1997-2000, and assigned numbers in 2866-2949 group in August 2000, along with 22 refurbished former D&RGW units.

e.

UP's model designation for these units is SD40-2T; refurbished units were called SD40-2TR.

f.

Individual unit histories:

Road
Number

First
Number

Second
Number

Date
Renumbered

UP 8644

SP 8356

UP 8649

SP 8325

UP 4379

23 Apr 1999

UP 8650

SP 8361

UP 8652

SP 8363

UP 8656

SP 8527

UP 8661

SP 8559

UP 8663

SP 8300

UP 8664

SP 8306

UP 8670

SP 8316

UP 8678

SP 8494

UP 8679

SP 8495

UP 8683

SP 8307

UP 8684

SP 8311

UP 8687

SP 8319

UP 4417

21 May 1998

UP 8689

SSW 8323

UP 4419

18 Nov 1997

UP 8691

SSW 8326

UP 8697

SP 8369

UP 4427

23 Jul 1997

UP 8702

SSW 8375

UP 4432

29 May 1998

UP 8703

SP 8499

UP 8707

SP 8504

UP 8711

SP 8509

UP 4441

14 Oct 1997

UP 8715

SP 8514

UP 8716

SP 8515

UP 8718

SP 8518

UP 8721

SP 8521

UP 8725

SP 8525

UP 4455

23 Nov 1997

UP 8726

SP 8526

UP 8737

SP 8340

UP 4467

22 Jan 1998

UP 8745

SP 8384

UP 8748

SP 8388

UP 4478

14 Dec 1998

UP 8751

SP 8534

UP 8755

SP 8540

UP 8756

SP 8541

UP 8759

SP 8544

UP 8766

SP 8553

UP 8767

SP 8554

UP 4497

28 Jul 1997

UP 8777

SP 8568

UP 8782

SP 8230

UP 8784

SP 8233

UP 8785

SP 8234

UP 8786

SP 8235

UP 8788

SP 8238

UP 8789

SP 8239

UP 8793

SP 8244

UP 8794

SP 8245

UP 8795

SP 8246

UP 8798

SP 8253

UP 4528

12 Jun 1998

UP 8799

SP 8254

UP 8800

SP 8255

UP 8801

SP 8256

UP 8802

SP 8257

UP 8803

SP 8259

UP 8804

SP 8261

UP 8805

SP 8262

UP 8807

SP 8267

UP 8810

SP 8271

UP 8813

SP 8276

UP 8815

SP 8279

UP 8819

SP 8283

UP 8822

SP 8287

UP 8828

SP 8297

UP 8848

SP 8567

UP 8849

SP 8573

UP 8850

SP 8232

UP 8852

SP 8241

UP 8854

SP 8248

UP 8855

SP 8249

UP 8858

SP 8263

UP 8860

SP 8266

UP 8861

SP 8269

UP 8862

SP 8273

UP 4592

14 May 1999

UP 8864

SP 8284

UP 4594

13 May 1998

UP 8865

SP 8288

UP 8867

SP 8295

UP 8868

SP 8296

g.

The following 99 SP/SSW units (of the original 231 units to UP at merger in September 1996) were assigned numbers in the UP 4369-4599 group, then the UP 8639-8869 group, but were retired by UP prior to being renumbered:

SP/SSW
Number

Assigned
UP Number

Builder
Date

Builder
Number

Date
Retired

Notes

SP 8231

UP 8783

Mar 1980

786265-2

31 Oct 2002

SP 8236

UP 8851

Mar 1980

786265-7

19 Dec 2001

SP 8240

UP 8790

Apr 1980

786265-11

10 Oct 2003

SP 8242

UP 8791

Apr 1980

786265-13

19 Dec 2000

SP 8247

UP 8853

Apr 1980

786265-18

27 Jun 2000

SP 8250

UP 8796

Apr 1980

786265-21

27 Jun 2000

SP 8251

UP 8797

Apr 1980

786265-22

28 Nov 2001

SP 8258

UP 8857

May 1980

786265-29

22 Aug 2001

SP 8265

UP 8806

May 1980

786265-36

23 May 2001

SP 8270

UP 8809

May 1980

786265-41

19 Apr 2001

SP 8272

UP 8811

Jun 1980

786265-43

28 Nov 2001

SP 8275

UP 8812

Jun 1980

786265-46

5 Dec 2003

5

SP 8277

UP 8814

Jun 1980

786265-48

18 Jun 2001

SP 8281

UP 8817

Jun 1980

786265-52

19 Apr 2001

SP 8283

UP 8819

Jun 1980

786265-54

24 Jan 2008

6

SP 8292

UP 8826

Jul 1980

786265-63

19 Dec 2002

SP 8293

UP 8827

Jul 1980

786265-64

24 Jan 2008

7

SP 8299

UP 8869

Jul 1980

786265-70

20 Jun 2000

SP 8308

UP 8668

Feb 1978

776069-2

31 Jul 2002

SP 8309

UP 8645

Feb 1978

776069-3

27 Aug 2002

SP 8310

UP 8669

Feb 1978

776069-4

16 Sep 2002

SP 8312

UP 8646

Feb 1978

776069-6

14 Aug 2002

SP 8313

UP 8647

Feb 1978

776069-7

27 Aug 2002

SP 8314

UP 8831

Feb 1978

776069-8

21 Nov 2000

SP 8315

UP 8685

Mar 1978

776069-9

17 Jan 2001

SP 8318

UP 8686

Mar 1978

776069-12

31 Jul 2001

SP 8321

UP 8688

Apr 1978

776069-15

20 Jun 2001

SP 8322

UP 8648

Jan 1978

776075-1

16 Sep 2002

SSW 8324

UP 8690

Jan 1978

776075-3

26 Sep 2001

SP 8327

UP 8838

Mar 1979

786175-1

17 Jan 2001

SP 8328

UP 8730

Mar 1979

786175-2

17 Jul 2001

SP 8329

UP 8731

Mar 1979

786175-3

28 Dec 2000

SP 8331

UP 8839

Apr 1979

786175-5

26 Jan 2000

SP 8335

UP 8735

Apr 1979

786175-9

23 May 2001

SP 8336

UP 8841

Apr 1979

786175-10

19 Dec 2001

SP 8337

UP 8736

Apr 1979

786175-11

19 Dec 2000

SP 8350

UP 8642

Jun 1974

73685-1

27 Aug 2002

SP 8352

UP 8666

Jun 1974

73685-3

16 Sep 2002

SP 8354

UP 8682

Jun 1974

73685-5

19 Dec 2000

SP 8355

UP 8643

Jun 1974

73685-6

6 Aug 2002

SP 8358

UP 8693

Feb 1978

776070-2

28 Jun 2001

SP 8359

UP 8671

Feb 1978

776070-3

14 Aug 2002

SP 8360

UP 8694

Feb 1978

776070-4

25 Feb 2000

SP 8362

UP 8651

Feb 1978

776070-6

10 Jul 2002

SP 8367

UP 8654

Mar 1978

776070-11

10 Jul 2002

SP 8368

UP 8696

Apr 1978

776070-12

31 Jul 2001

SP 8370

UP 8698

Apr 1978

776070-14

28 Feb 2002

SSW 8372

UP 8700

Jan 1978

776076-1

18 Apr 2000

SSW 8374

UP 8832

Jan 1978

776076-3

17 Jan 2001

SP 8377

UP 8738

May 1979

786201-1

28 Dec 2000

SP 8378

UP 8739

May 1979

786201-2

18 Jun 2001

SP 8382

UP 8743

May 1979

786201-6

29 Aug 2001

SP 8386

UP 8747

Jun 1979

786201-10

23 May 2001

SP 8387

UP 8844

Jun 1979

786201-11

27 Feb 2001

SP 8390

UP 8750

Jun 1979

786201-14

26 Sep 2001

SP 8391

UP 8845

Jun 1979

786201-15

30 Nov 1999

SP 8492

UP 8676

Feb 1978

776068-4

10 Jul 2002

SP 8496

UP 8680

Feb 1978

776068-8

16 Sep 2002

SP 8497

UP 8681

Jan 1978

776068-9

10 Jul 2002

SP 8498

UP 8833

Jan 1978

776068-10

31 Jul 2001

SP 8500

UP 8704

Nov 1978

786174-2

12 Jul 2001

SP 8503

UP 8706

Nov 1978

786174-5

31 Oct 2002

SP 8505

UP 8708

Nov 1978

786174-7

23 May 2001

SP 8506

UP 8709

Nov 1978

786174-8

17 Mar 2000

SP 8508

UP 8710

Nov 1978

786174-10

26 Jan 2000

SP 8510

UP 8712

Nov 1978

786174-12

15 Jul 2002

SP 8513

UP 8834

Nov 1978

786174-15

4 Dec 1997

8

SP 8516

UP 8835

Nov 1978

786174-18

23 May 2001

SP 8517

UP 8717

Nov 1978

786174-19

23 May 2001

SP 8519

UP 8719

Dec 1978

786174-21

23 May 2001

SP 8520

UP 8720

Dec 1978

786174-22

18 Jun 2001

SP 8522

UP 8722

Dec 1978

786174-24

19 Dec 2000

SP 8523

UP 8723

Dec 1978

786174-25

7 Feb 2001

SP 8524

UP 8724

Dec 1978

786174-26

19 Dec 2001

SP 8528

UP 8657

Dec 1978

786174-30

27 Aug 2002

SP 8529

UP 8727

Dec 1978

786174-31

30 Nov 2002

SP 8530

UP 8836

Dec 1978

786174-32

19 Apr 2001

SP 8531

UP 8728

Dec 1978

786174-33

21 Jan 2002

SP 8532

UP 8729

Dec 1978

786174-34

15 Nov 2001

SP 8533

UP 8837

Dec 1978

786174-35

28 Nov 2001

SP 8536

UP 8847

Jan 1979

786174-38

23 May 2001

SP 8537

UP 8752

Jan 1979

786174-39

22 Aug 2001

SP 8539

UP 8754

Jan 1979

786174-41

12 Oct 2000

SP 8542

UP 8757

Jan 1979

786174-44

27 Feb 2001

SP 8543

UP 8758

Jan 1979

786174-45

29 Jan 2001

SP 8546

UP 8761

Jan 1979

786174-48

22 Aug 2001

SP 8547

UP 8762

Jan 1979

786174-49

19 Dec 2001

SP 8548

UP 8658

Jan 1979

786174-50

6 Aug 2002

SP 8550

UP 8763

Jan 1979

786174-52

23 May 2001

SP 8556

UP 8769

Feb 1979

786174-58

10 Jul 2002

9

SP 8557

UP 8660

Feb 1979

786174-59

28 Feb 2002

10

SP 8560

UP 8662

Feb 1979

786174-62

6 Aug 2002

SP 8564

Feb 1979

786174-66

15 Nov 2001

SP 8565

Feb 1979

786174-67

22 Aug 2001

SP 8566

UP 8776

Feb 1979

786174-68

31 Jan 2003

SP 8569

Feb 1979

786174-71

7 Feb 2001

SP 8570

Feb 1979

786174-72

27 Apr 2001

SP 8571

UP 8780

Feb 1979

786174-73

31 Oct 2002

SP 8572

Feb 1979

786174-74

12 Oct 2000

Notes:

1.

UP 8684 (ex SP 8311) was the first unit in this group to be repainted to this number series, completed on 13 December 1999.

2.

UP 8755 (ex SP 8540) was donated to San Antonio (Texas) Fire Department Training Academy; moved during early June 2009. (update from Dave Sunderland via email, June 14, 2009)

3.

UP 8803 (ex SP 8259) was painted in full UP yellow and gray, completed on 21 September 2006. (information from Jim Haguewood)

4.

UP 8852 (ex SP 8241) was previously shown (due to a clerical error) as retired on 19 December 2001; still in service as of 11 June 2006; retired in late January 2008.

5.

SP 8275 (assigned UP 8812) was renumbered to UP 7906 on 3 December 2003 by Progress Rail as part of the Peak Power fleet .

6.

SP 8283 (assigned UP 4549, then UP 8819) arrived at Roseville, California, on June 3, 2006; as of November 2007, the unit was still active and not retired, but is in dead storage at Roseville, with parts missing.

7.

SP 8293 (assigned UP 8827) was removed from service at South Morrill, Nebraska, on 8 November 2004 due to diesel engine failure; stored at Progress Rail at South Morrill until moved to North Platte, Nebraska, on 8 October 2005; moved to Denver, Colorado, still there as of mid September 2007; retired in late January 2008.

8.

SP 8513 (assigned UP 8834) was wrecked on 25 October 1997 at West Junction (Houston), Texas, scrapped at wreck site.

9.

SP 8556 (assigned UP 8769) was retired by UP on 26 April 2002 and sold to Helm Financial to replace wrecked SP 8557, leased from Helm Financial; still in UP operational fleet (see Note 9, below).

10.

SP 8557 (assigned UP 8660) was wrecked on 2 January 2002 at Broadmoor, Illinois; retired due to wreck damage; retired and replaced as a Helm-leased unit by SP 8556 (see Note 8, above).