Boston & Maine Railroad Historical Society

Diesel Classification Guide

44 Tonner (AAR Class B-B)

Diesel No.	110	111	112	113	114	115	116	117	118	119
Date Built	1940				1941			1942	1947	1948
Order No.	B-72578				B-86794			B-6374	X-16569	XB-117T426

BL-2 (B-B)

Diesel No.	1550	1551	1552	1553
Date Built	1948
Order No.	E-889

E-7 (A1A-A1A, B&M Class DP1a)

Diesel No.	3800	3801	3802	3803	3804	3805	3806	3807	3808	3809	3810	3811	3812
Date Built	1945		1946
Order No.	E-670-1	E-670-2	E-670-3	E-670-4	E-670-5	E-670-6	E-670-7	E-670-8	E-670-9	E-670-10	E-670-11	E-670-12	E-670-13

Diesel No.	3813	3814	3815	3816	3817	3818	3819	3820
Date Built	1946			1948				1949
Order No.	E-670-14	E-670-15	E-670-16	E-927	E-927	E-927	E-927	E-1172

E-8 (A1A-A1A, DP1b)

Diesel No.	3821
Date Built	1950
Order No.	E-2008

F-2 (B-B)

Diesel No.	4224		4225¹		4226
Unit	A	B	A	B	A	B
Date Built	1946
Order No.	E-725		E-649	E-725

¹See below

F-2 (B-B)

Diesel No.	4250	4251	4252	4253	4254	4255	4256	4257	4258	4259	4260	4261	4262
Date Built	1946
Order No.	E-649

Diesel No.	4263¹	4264
Date Built	1946
Order No.	E-649

¹The original #4225A was wrecked on the "Ambassador" at Cannan NH. The boiler from the scrapped locomotive was transplanted to #4263, which was then renumbered to #4225A in November 1949. (See above)

F-3 (B-B)

Diesel No.	4227		4228
Unit	A	B	A	B
Date Built	1948
Order No.	E-925

F-7 (B-B)

Diesel No	4265		4266		4267		4268
Unit	A	B	A	B	A	B	A	B
Date Built	1949	1950	1949	1950	1949	1950	1949	1950
Order No.	E-1174	E-6138	E-1173	E-6138	E-1173	E-6150	E-6059	E-6150

FT (B-B, DF1a)

Diesel No

4200

4201

4202

4203

4204

4205

4206

4207

4208

4209

4210

4211

Unit

Date Built

1943

1944

Order No

Diesel No

4212

4213

4214

4215

4216

4217

4218

4219

4220

4221

4222

4223

Unit

Date Built

1944

Order No

GP-7R (B-B)

Diesel No.	1555	1556	1557	1558	1559	1560	1561	1562
Date Built	1950
Order No	E-6149						E-6165

GP-7L (B-B)

Diesel No.	1563	1564	1565	1566	1567	1568	1569	1570	1571	1572	1573	1574	1575	1576	1577
Date Built	1952									1953
Order No	E-6337									E-5221

Alco HH600¹ (B-B)

Diesel No.	1100²	1101	1102	1161³	1162
Class		404-DL-198	404-OE-198
Date Built	1935	1938	1934	1938	1939
Order No.	01-4167	S-1800	1728	S-1800	S-1818

¹"High Hood"
²Referred to as the "Ingersol-Rand" or the "Center Cab"³Renumbered from 1101 when the engine was upgraded to 660hp. (Former ALCO demonstrator #602)

NW-2 (B-B)

Diesel No	1200	1201	1202	1203	1204	1205	1206	1207	1208	1209	1210	1211	1212	1213
Date Built	1941		1942			1946			1949
Order No.	E-431		E-535			726			E-1153		E-1092

RS-2 (B-B)

Diesel No.	1500	1501	1502	1503	1504	1530	1531	1532	1533	1534
BM Class	DRS1a	DRS1c
Date Built	1948	1949
Order No.	SO 20227	SO 20352				SO 20380

RS-3 (B-B)

Diesel No	1505	1506	1507	1508	1509	1510	1511	1512	1513	1514	1515	1516	1516	1517	1518	1519	1535	1536	1537	1538	1539	1540	1541	1542	1543	1544	1545
BM Class	DRS1e																DRS1d
Date Built	1954																1952
Order No	SO 20874																SO 20730

S-1 (B-B)

Diesel No	1163	1164	1165	1166	1167	1168	1169	1170	1171	1172	1173	1174	1175	1176
Date Built	1944			1948		1949					1950
Order No	S-1934-9	S-1934-19	S-1942-3	SO 20210				SO 20351			SO 20543

Diesel No	1177	1178	1179	1180	1181	1182	1183	1184	1185	1186	1187	1188
Date Built	1952
Order No	SO 20731

S-2 (B-B)

Diesel No	1260	1261	1262	1263	1264	1265	1266	1267	1268	1269	1270	1271	1272	1273
Date Built	1944			1945			1950
Order No	S-1930-63	S-1930-64	S-1930-65	S-1965	S-1970		SO 20544

S-5 (B-B, DS-6b)

Diesel No	860	861	862	863	864	865
Date Built	1954
Order No	SO 20873

SC (B-B)

Diesel No	1103	1104	1105	1106	1107	1108
Date Built	1936			1938
Order No	E-141			E-204

SW-1 (B-B)

Diesel No	1109	1110	1111	1112	1113	1114	1115	1116	1117	1118
Date Built	1939			1941		1946				1949
Order No	E-288			E-430		E-727				E-1154

Diesel No	1119	1120	1121	1122	1123	1124	1125	1126	1127	1128	1129	1130	1131	1132
Date Built	1953
Order No	E-4214

S-8 (B-B)

Diesel No	800	801	802	803	804	805	806	807
Date Built	1953
Order No	E-4224

S-9 (B-B)

Diesel No	1220	1221	1222	1223	1224	1225	1226	1227	1228	1229	1230	1231
Date Built	1952							1953
Order No	E-6338							E-4208			E-4226

Sacred Cow

Diesel No	1140
Date Built	1935
Order No	Unknown

Thanks to Tim Gilbert, John Hutchins, "John from NY", Bruce Bowden, Scott Whitney, and James VanBokkelen for providing supporting data.
©BMRRHS

Boston & Maine Railroad Historical Society

Diesel Classification Guide

44 Tonner (AAR Class B-B)

BL-2 (B-B)

E-7 (A1A-A1A, B&M Class DP1a)

E-8 (A1A-A1A, DP1b)

F-2 (B-B)

F-2 (B-B)

F-3 (B-B)

F-7 (B-B)

FT (B-B, DF1a)

GP-7R (B-B)

GP-7L (B-B)

Alco HH6001 (B-B)

NW-2 (B-B)

RS-2 (B-B)

RS-3 (B-B)

S-1 (B-B)

S-2 (B-B)

S-5 (B-B, DS-6b)

SC (B-B)

SW-1 (B-B)

S-8 (B-B)

S-9 (B-B)

Sacred Cow

Alco HH600¹ (B-B)