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Qty.	Road	Numbers	Date	Builder's #s	Phase	Air Filter	Notes
20	ATSF	6300-6319	6-9/70	37491-37510	IIce*	paper	AAR-B trucks
29	ATSF	6320-6348	9/70-2/71	37511-37539	IIe	paper	AAR-B trucks; 6332 rebuilt to SF30B 7200, re# 6419
30	C&O	2300-2329	9-10/69	37228-37257	IIc	paper	Blomberg B trucks; 17 to CSX 3200:3229
10	CR	2789-2798	5-6/77	41584-41593	IIh2	paper	AAR-B trucks; CR 2798 last U23B built
16	D&H	301-316	8-9/68	36803-36818	IIa	oil bath	AAR-B trucks; 315 wrecked 4/20/71, rest re# 2301-2314,2316
10	FCP	537-546	8-9/75	40820-40829	IIh1	paper	Ferrocarril del Pacifico; AAR-B trucks
20	L&N	2708-2727	2-3/73	38765-38784	IIg	paper	FB-2 trucks; 2708-2717 to SBD 3238-3247 2718 wrecked 9/28/77 2719-2727 to SBD 3248-3256
25	L&N	2728-2752	6-9/73	39257-39281	IIg	paper	FB-2 trucks; to SBD 3257-3281
20	L&N	2753-2772	2-3/74	39508-39527	IIg	paper	FB-2 trucks; 2753-2770 to SBD 3282-3299 2771 wrecked 4/2/80 2772 to SBD 3300
25	L&N	2800-2824	1-2/75	40110-40134	IIh1	paper	FB-2 trucks; 2800-2802 to SBD 3301-3303 2803 wrecked 7/6/78, re# 2818 and retired 8/16/78 2804-2817 to SBD 3305-3318 2818 wrecked 8/6/78, rebuilt and re# 2803, to SBD 3304 2819-2824 to SBD 3319-3324
12	LV	501-512	11/74	40098-40109	IIh1	paper	AAR-B trucks; to CR 2777-2788
5	MILW	4800-4804	8/73	38872-38876	IIg	paper	FB-2 trucks, no d/b, latches on al doors
3	MKT	350-352	5/73	39225-39227	IIge**	paper	AAR-B trucks, no d/b
8	MON	601-608	3-5/70	37923-37300	IIc	oil bath	AAR-B trucks, no d/b; to L&N 2700-2707, SBD 230-3237
7	MP	668-674	1/73	38758-38764	IIg	paper	FB-2 trucks, no d/b; re# 2250-2256, then 4500-4506
11	MP	2257-2267	11/74	39905-39915	IIg	paper	FB-2 trucks, no d/b; re# 4507-4517
6	MP	2268-2273	3/75	40356-40361	IIh1	paper	FB-2 trucks no d/b; 2268-2270 re# 4518-4520 2271 wrecked 10/78 2272,2273 re# 4521,4522
5	MP	2274-2278	6/76	40920-40924	IIh2	paper	FB-2 trucks, no d/b; re# 4523-4527
10	MP	2279-2288	1-2/77	41523-41532	IIh2	paper	FB-2 trucks, no d/b; re# 4528-4537
14	NdeM	9100-9113	3/75	40326-40339	IIh1	paper	FB-2 trucks
8	NdeM	9114-9121	3-4/75	40340-40347	IIh1	paper	AAR-B trucks
8	NdeM	9122-9129	5-6/75	40348-40355	IIh1	paper	FB-2 trucks
50	PC	2700-2749	8-10/72	38506-38555	IIf	paper	AAR-B trucks; to CR same #s
27	PC	2750-2776	8-10/73	39305-39331	IIg	paper	AAR-B trucks, bidirectional controls, long hood forward; to CR same #s
5	SOU	3900-3904	5/72	38392-38396	IIg	oil bath	hi-nose, AAR-B trucks
10	SOU	3905-3914	5/73	39215-39224	IIg	oil bath	hi-nose, AAR-B trucks
20	SOU	3915-3934	5-6/74	39621-39640	IIg	paper	hi-nose, AAR-B trucks
20	SOU	3935-3954	5-7/75	40078-40097	IIh1	paper	hi-nose, FB-2 trucks
15	SOU	3955-3969	12/76-2/77	41508-41522	IIh1	paper	hi-nose, FB-2 trucks
6	SPC	40-45	10-11/75	40372-40377	IIh1	paper	Southern Peru Copper; FB-2 trucks; have an additional radiator core over the equipment blower to relieve the main radiator during long periods of dynamic brake operation in tunnels
8	SPC	50-57	3-5/75	40362-40369	IIh1	paper	Southern Peru Copper; FB-2 trucks; equipped for radio control
2	SPC	58,59	10,11/75	40370,40371	IIh1	paper	Southern Peru Copper; FB-2 trucks; equipped for radio control
1	TU	103	5/75	40719	IIh1	paper	Texas Utilities; AAR-B trucks, no d/b, equipped for remote control
15	WP	2251-2265	5-7/72	38397-38411	IIf	paper	Blomberg B trucks, dual controls; 2256 wrecked 11/17/79 2259 wrecked 9/81 traded in for UP 8-40Cs, used as cores for Super 7 program
U23B Phases GE used a common body for the various U-boats, so this list is based on phases of the U30B. Phase IIa- entire hood below the radiator is the same width as the radiator itself, radiator intakes are redesigned, the raised section on the radiator disappears, a horizontal drip rail appears on the sides of the radiator, short exhaust stack, small taper just ahead of the radiator. Phase IIb- the taper just ahead of the radiator disappears. Phase IIc- the intake screens become corrugated instead of flat, and project slightly from the hood instead of being flush-mounted. Phase IId- horizontal drip rail on the radiator disappears. Phase IIe- built-up area on pilots disappears. Phase IIf- handrail notch in the stepwells becomes full length. Phase IIg- headlight casing becomes oval-shaped, not rectangular; cab side drip rail disappears. Phase IIh1- square door laches become standard, battery box covers become smaller, cab door stiffener appears. Phase IIh2- separate front headlight casing, hinges on front numberboards appear.
- ATSF 6300-6319 lacked the built-up area on the pilot, but were otherwise Phase IIc *- MKT 350-352 had the short notch handrail stepwell, but were otherwise Phase IIg

Qty.

Road

Numbers

Date

Builder's #s

Phase

Air Filter

Notes

ATSF

6300-6319

6-9/70

37491-37510

IIce*

paper

AAR-B trucks

ATSF

6320-6348

9/70-2/71

37511-37539

IIe

paper

AAR-B trucks; 6332 rebuilt to SF30B 7200, re# 6419

C&O

2300-2329

9-10/69

37228-37257

IIc

paper

Blomberg B trucks; 17 to CSX 3200:3229

2789-2798

5-6/77

41584-41593

IIh2

paper

AAR-B trucks; CR 2798 last U23B built

D&H

301-316

8-9/68

36803-36818

IIa

oil bath

AAR-B trucks; 315 wrecked 4/20/71, rest re# 2301-2314,2316

FCP

537-546

8-9/75

40820-40829

IIh1

paper

Ferrocarril del Pacifico; AAR-B trucks

L&N

2708-2727

2-3/73

38765-38784

IIg

paper

FB-2 trucks;
2708-2717 to SBD 3238-3247
2718 wrecked 9/28/77
2719-2727 to SBD 3248-3256

L&N

2728-2752

6-9/73

39257-39281

IIg

paper

FB-2 trucks; to SBD 3257-3281

L&N

2753-2772

2-3/74

39508-39527

IIg

paper

FB-2 trucks;
2753-2770 to SBD 3282-3299
2771 wrecked 4/2/80
2772 to SBD 3300

L&N

2800-2824

1-2/75

40110-40134

IIh1

paper

FB-2 trucks;
2800-2802 to SBD 3301-3303
2803 wrecked 7/6/78, re# 2818 and retired 8/16/78
2804-2817 to SBD 3305-3318
2818 wrecked 8/6/78, rebuilt and re# 2803, to SBD 3304
2819-2824 to SBD 3319-3324

501-512

11/74

40098-40109

IIh1

paper

AAR-B trucks; to CR 2777-2788

MILW

4800-4804

8/73

38872-38876

IIg

paper

FB-2 trucks, no d/b, latches on al doors

MKT

350-352

5/73

39225-39227

IIge**

paper

AAR-B trucks, no d/b

MON

601-608

3-5/70

37923-37300

IIc

oil bath

AAR-B trucks, no d/b; to L&N 2700-2707, SBD 230-3237

668-674

1/73

38758-38764

IIg

paper

FB-2 trucks, no d/b; re# 2250-2256, then 4500-4506

2257-2267

11/74

39905-39915

IIg

paper

FB-2 trucks, no d/b; re# 4507-4517

2268-2273

3/75

40356-40361

IIh1

paper

FB-2 trucks no d/b;
2268-2270 re# 4518-4520
2271 wrecked 10/78
2272,2273 re# 4521,4522

2274-2278

6/76

40920-40924

IIh2

paper

FB-2 trucks, no d/b; re# 4523-4527

2279-2288

1-2/77

41523-41532

IIh2

paper

FB-2 trucks, no d/b; re# 4528-4537

NdeM

9100-9113

3/75

40326-40339

IIh1

paper

FB-2 trucks

NdeM

9114-9121

3-4/75

40340-40347

IIh1

paper

AAR-B trucks

NdeM

9122-9129

5-6/75

40348-40355

IIh1

paper

FB-2 trucks

2700-2749

8-10/72

38506-38555

IIf

paper

AAR-B trucks; to CR same #s

2750-2776

8-10/73

39305-39331

IIg

paper

AAR-B trucks, bidirectional controls, long hood forward; to CR same #s

SOU

3900-3904

5/72

38392-38396

IIg

oil bath

hi-nose, AAR-B trucks

SOU

3905-3914

5/73

39215-39224

IIg

oil bath

hi-nose, AAR-B trucks

SOU

3915-3934

5-6/74

39621-39640

IIg

paper

hi-nose, AAR-B trucks

SOU

3935-3954

5-7/75

40078-40097

IIh1

paper

hi-nose, FB-2 trucks

SOU

3955-3969

12/76-2/77

41508-41522

IIh1

paper

hi-nose, FB-2 trucks

SPC

40-45

10-11/75

40372-40377

IIh1

paper

Southern Peru Copper; FB-2 trucks; have an additional radiator core over the equipment blower to relieve the main radiator during long periods of dynamic brake operation in tunnels

SPC

50-57

3-5/75

40362-40369

IIh1

paper

Southern Peru Copper; FB-2 trucks; equipped for radio control

SPC

58,59

10,11/75

40370,40371

IIh1

paper

Southern Peru Copper; FB-2 trucks; equipped for radio control

103

5/75

40719

IIh1

paper

Texas Utilities; AAR-B trucks, no d/b, equipped for remote control

2251-2265

5-7/72

38397-38411

IIf

paper

Blomberg B trucks, dual controls;
2256 wrecked 11/17/79
2259 wrecked 9/81
traded in for UP 8-40Cs, used as cores for Super 7 program

U23B Phases

GE used a common body for the various U-boats, so this list is based on phases of the U30B.

Phase IIa- entire hood below the radiator is the same width as the radiator itself, radiator intakes are redesigned, the raised section on the radiator disappears, a horizontal drip rail appears on the sides of the radiator, short exhaust stack, small taper just ahead of the radiator.

Phase IIb- the taper just ahead of the radiator disappears.

Phase IIc- the intake screens become corrugated instead of flat, and project slightly from the hood instead of being flush-mounted.

Phase IId- horizontal drip rail on the radiator disappears.

Phase IIe- built-up area on pilots disappears.

Phase IIf- handrail notch in the stepwells becomes full length.

Phase IIg- headlight casing becomes oval-shaped, not rectangular; cab side drip rail disappears.

Phase IIh1- square door laches become standard, battery box covers become smaller, cab door stiffener appears.
Phase IIh2- separate front headlight casing, hinges on front numberboards appear.

*- ATSF 6300-6319 lacked the built-up area on the pilot, but were otherwise Phase IIc
**- MKT 350-352 had the short notch handrail stepwell, but were otherwise Phase IIg

GE's U23B - Original Owners

by Robert Sarberenyi

425 US, 40 Mexico, 16 Export