This began as a place to keep my notes for some modeling projects. I hope others find them useful; comments, corrections and contributions are welcome. Related information can be found in my B&M Steam Roster page.
The B&M, like most other railraods, had an active upgrading program for their steam locomotives that continued into the post-WWII era. Because many of the engines that survived into the 1950s had been built before 1920, shop forces had applied significant improvements like superheating, feedwater heaters and power reverses, along with smaller B&M details like train lighting equipment and Automatic Train Control (for Fitchburg Division servce). Furthermore, the B&M (like most railroads) tended to divide its purchases between competitive suppliers. Thus, not all engines in a class were equipped the same, and engines with the same equipment often had it installed differently.
What to do about this depends on the level of accuracy and detail you want. Imported brass models look nice, but even if the manufacturers did enough research to accurately model one or more engines at some specific time, they rarely include that data in the package (a notable exception is New England Rail Service; Thanks, Don). This began as an effort to figure out what number I ought to apply to a stock 1949-era Overland P-2c. I hope it is useful to at least a few of you. I plan to expand it as I work on more steam projects in the future, and contributions from others are welcome.
The P-2c class was built by Alco in 1916, with longer tenders than earlier P-2s - water capacity was 7400 gallons. I don't have any photos in "as delivered" condition, but I expect they had a single air pump; at that time, they could have been delivered with superheating. After Automatic Train Control was installed on the Fitchburg Division, some of the engines received control boxes mounted on the engineer's side between the steam and sand domes. During the late 1920s, Worthington feedwater heaters were applied on the fireman's side forward of a cross-compound air-pump. Initially, the running board was cut out around the unit, but by the end of WWII a raised section had been added, with steps at each end. During the late 1930s, power reverses were applied, with the engineer's side running board raised in segments at two or three different levels over them. Scrapping began in 1951, but 3687 survived until the very end.
An HO brass P-2c was imported by Overland in 1998, in several configurations. One was based on 3681 and 3688 circa 1927, and painted in a special buff and blue scheme for Minute Man service. I don't know if the model had an ATC box, but it was required by that time on Fitchburg Division engines. Another version represents 3686 and 3689 circa 1930, factory painted in a two-tone green scheme for Flying Yankee service. Per the Vol. 17 #3 Bulletin , these tenders were modified to hold 8700 gallons of water. Per the April 1986 Bulletin , at least the latter two engines had been repainted by 1935/6.
A third version (OMI 1556) is labeled "circa 1949", for 3680 - 3687. It has a Worthington feedwater heater and forward train lighting connections. A boxpox main driver is included if you want to install it in place of the spoked original. There is no Automatic Train Control box. The headlight has prominent numberboard "wings". There is an air tank behind the pilot deck. The running board is raised over the power reverse, in two different levels. There is an air tank behind the power reverse below the raised section of the running board, but above the main running board level. The reverse rod goes to a lever that protrudes through the top running board step from the top of the power reverse casting. The power reverse unit doesn't have any crosshead or guides, and isn't actually connected to the reverse gear.
So far, the model appears to be correct for 3680 after 1946 except for the reverse rod location and power reverse casting, which doesn't have the conspicuous crosshead and guides visible in photos. If 3684 also got the auxilliary air tank behind the power reverse in the late 1940s, as 3680 and 3688 did, it would also be close. The model can't be 3681, 3682, 3683, 3687 or 3688 (all had three-level running boards over the power reverse). I haven't found good post-WWII photos of the engineer's (RH) side of 3685, 3686 or 3689.
ATC, at least pre-WWII. 3 levels used in raising running board over power reverse.
ATC, at least post-WWII. Three levels used in raised running board over power reverse on engineer's side (RH). Running board originally installed over Worthington FWH on fireman's side (LH) discontinuously, later made continuous with steps at each end.
No ATC box, 2 levels in running board over power reverse (but reverse rod enters from rear), steps on each end of running board over Worthington FWH.
ATC equipped 1927 to retirement. 3 levels in running board over power reverse. Can't tell about LH side so far.
The first group (P-4a) of these engines were built by Lima in 1934 with a single cross-compound air pump and a cowl along most of the top of the boiler. The second group (P-4b) arrived in 1937, also with a single air pump, but without the cowl. Tender capacity was 12,000 gallons of water and 18.5 tons of coal. The Isothermos tender truck journals are sometimes confused with roller bearings.
During WWII, the P-4a group lost their cowls, and both groups had a second cross-compound air pump added to the pilot deck.
Drawings can be found in the Bulletin Vol. XVII #3 and in the Steam Locomotive Cyclopedia
The T-1a class (4000 - 4019) was built by Lima in 1928, with 4-wheel tender trucks. According to Minuteman Steam, half of them received longer, welded 12-wheel tenders circa 1940, but it doesn't say which engines got them. From published photos, I'm sure that 4015 - 4019 received the larger tenders between 1935 and 1940. Because I haven't seen any others with larger tenders (other than the cover of Vanishing Markers, which is captioned 4007 but isn't clear enough to check), I doubt that more than those five engines had them at the beginning of the war. Studying the photos has led to a few other conclusions:
The T-1b class was built in 1929, with 12-wheel riveted tenders and inside steam pipes to the cylinders. All engines of both classes had boosters on the trailing truck. Originally, these exhausted through a pipe that ran up the RH side of the engine to behind the stack. Later the exhaust was relocated to the tender deck ahead of the water fill. Photos lead me to believe that this was completed by the mid-1930s.
|4000||21-Aug-1940||Spring 1979 Bulletin||LH side, LF 1/4, 8-wheel tender|
|B&M Locomotives||LF 1/4, 8-wheel tender|
|April 1942||Bulletin Vol. XVII #2||RF 1/4, 8-wheel tender, still has Baker valve gear, original crosshead.|
|4001||30-Jul-1945||Fall 1980 Bulletin||8-wheel tender, painted ATSF 4193|
|4002||1947||from Bruce Bowden||8-wheel tender, as SP 3501|
|4003||31-Aug-1944||NH and VT Railroads by Ron Johnson p. 33||8-wheel tender|
|4004||circa 1940||Spring 1975 Bulletin||RF 1/4, 8-wheel tender|
|6-Jun-1943||WInter '78-'79 and Vol. XVI #2 Bulletin||RF 1/4, 8-wheel tender|
|30-Jul-1945||Fall 1980 Bulletin||LH side, 8-wheel tender, painted ATSF 4194|
|4005||1934||Minuteman Steam p. 146||RH side, smoke deflectors, 8-wheel tender, booster exhaust on tender|
|1928||March 1985 Bulletin||LF 1/4, 8-wheel tender|
|?4006?||1938||April 1986 Bulletin, City & Shore p. 186, Memories of the B&M||Front, color, 8-wheel tender|
|4007||1939||Winter '82-'83 Bulletin||RF 1/4, 8-wheel tender|
|Spring 1983 Bulletin||LF 1/4, 8-wheel tender|
|?4007?||Vanishing Markers p. 54||LH side, 12-wheel tender w/stripe|
|4009||29-Mar-1942||Winter '78-'79 Bulletin||LF 1/4, 8-wheel tender|
|1935||Conn. River RRs & Connections Vol. 1 p.117||LF 1/4, 8-wheel tender|
|WWII||B&M Locomotives||LF 1/4, 8-wheel tender|
|Bulletin Vol. XVIII #2||LF 1/4, 8-wheel tender|
|Vanishing Markers p.64||RF 1/4, 8-wheel tender|
|?4010?||pre-1945||Forest, River & Mountain pp. 172-3||Several views, color, 8-wheel tender|
|4011||23-May-1941||Bulletin Vol. XXII #3||RF 1/4, 8-wheel tender|
|4012||1940||Minuteman Steam, Spring 1977 Bulletin, B&M Locomotives||RF 1/4, 8-wheel tender.|
|1-Jul-1945||Bulletin Vol. 20 #4||Front, 8-wheel tender.|
|4013||Spring 1980 Bulletin||Front|
|4014||Oct. 1941||Bulletin Vol. 22 #2||RF 1/4, 8-wheel tender|
|Mar. 1938||Vanishing Markers p.102||RH side, 8-wheel tender|
|Conn. River RRs & Connections Vol. 5 p. 129||LH side, 8-wheel tender|
|4015||Forest, River & Mountain p. 157||LF 1/4, 8-wheel tender, E. Deerfield MA|
|Fall '76 Bulletin||LF 1/4, 12-wheel tender, Westminster MA|
|Bulletin Vol. XXII #3||LF 1/4, 12-wheel tender, white stripe|
|4016||June '74 Bulletin||12-wheel tender, Tyngsboro MA|
|Conn. River RRs & Connections Vol. 2 p. 194||RH side, 12-wheel tender, Greenfield MA|
|4017||Aug. 1935||Fall '83 Bulletin||LF 1/4, 12-wheel tender, white stripe on tender|
|Mar. 1946||Winter '74-'75 Bulletin||LF 1/4, 12-wheel tender, Rigby|
|4018||Feb-1940||Forest, River & Mountain p. 158, Memories of the B&M||Color, LF 1/4 12-wheel tender, E. Deerfield, MA|
|9-Oct-1940||Minuteman Steam p. 145||12-wheel tender, Johnsonville NY|
|4019||1934?||Conn. River RRs & Connections Vol. 9, p. 45||RH side, 12-wheel tender, Boscawen, NH|
|1938||Memories of the B&M||Color, LF 1/4, 12-wheel tender, Worcester|
|Aug-1938||Forest, River & Mountain p. 135, Memories of the B&M||Color, LR 1/4, 12-wheel tender, S. Ashburnham|
|23-May-1941||Bulletin Vol. XVII #2||Front, 12-wheel tender, Lowell Jct.|
|9-Jun-1943||Fall '76 and Vol. XVI #2 Bulletin||LF 1/4, 12-wheel tender, E. Fitchburg, MA|
|4020||20-Nov-1938||Bulletin Vol. XXI #1||LR 1/4|
|4021||N.E. States Ltd. Vol. IV #4||RF 1/4|
|4022||Jan. 1938||Spring 1983 Bulletin||LF 1/4|
|4023||1934||Minuteman Steam p. 144||RH side, smoke deflectors, Concord, NH|
|Fall 1976 Bulletin||LF 1/4, E. Fitchburg, MA|
|18-Apr-1939||Winter '83-'84 Bulletin||Front, Eagle Bridge NY|
|2-Sep-1940||Bulletin Vol. XX #4||RF 1/4, Cardigan NH|
|Conn. River RRs & Connections Vol. 9 p 45||Front, smoke deflectors, White River Jct.|
|circa 1950||B&M - A Photograhic Essay, pp. 182 - 184||Several views, Mechanicville, NY|
|4024||Fall 1976 Bulletin||LF 1/4, S. Ashburnham, MA|
|1946||Bulletin Vol. XVII #2||LF 1/4, Lowell Jct.|