GE "B40-8/W" Locomotives

The GE B40-8 and B40-8W (also known as a 8-40B) was the single, most powerful four-axle diesel locomotive the company ever produced, and also the last. Built during the late 1980s the design came in two versions using either the common standard cab of the time or the newer, wide "safety" cab, which did away with side cab doors and walkways (ultimately only one railroad purchased the wide-cab version). By the early 1990s this feature was a standard requirement of the Federal Railroad Administration (to increase crew protection in the even of a collision). While sales for the 8-40B included more than 200 units by the late 1980s with General Electric a major locomotive builder (and actually the industry leader at that point) those types of numbers were marginal, at best. 

Today, one can still find several examples operating on BNSF (B40-8W's) while all other Class I's have retired or sold theirs.  However, you can still catch examples in service on short lines and regionals.  It is fascinating that Electro-Motive's first and second-generation power finds greater interest among these smaller carriers than GE products from the same era.

From high above we see CSX B40-8 #5932 leading a westbound pig train across the Potomac River Bridge at Tunnel Hill, Maryland on the morning of October 24, 1993. Wade Massie photo.

The GE B40-8 followed the builder's earlier B39-8 and featured the same upgraded carbody design. The only significant difference between the two models was the B40-8's 4,000 horsepower (the locomotive continued to use General Electric's proven 4-cycle, 16-cylinder FDL prime mover). The classification behind the GE B40-8 continued to conform to the company's standard designation for its locomotives. For instance, the "B" regarded its four-axle truck setup (B-B) while the "40" referred to it having 4,000 horsepower. The "8" reference simply meant it was a model of GE's "Dash 8" series. As with earlier designs like the B39-8 GE continued to use its highly successful model 752AF traction motors that offered 68,500 pounds of starting tractive effort and 68,000 pounds continuous.

When the New York, Susquehanna & Western was granted trackage rights over the Delaware & Hudson, CSX financed a fleet of twenty-four B40-8's between 1988-1989. Seen here are four arriving at SK Yard in Buffalo, New York with train SLN-3 (a Sea-Land train of containers from New Jersey) on February 2, 1991. After Canadian Pacific acquired the D&H the units were transferred back to CSX. Doug Kroll photo.

By the late 1980s GE and Electro-Motive were both finding sales for high-horsepower, four-axle diesel locomotives tough (EMD's GP59 and GP60 models, for example, sold just over 400 units combined). Not only could six-axle models produce more tractive effort with two additional axles but the those extra wheels also allowed them to spread out more of their weight across the rails (thus allowing for reduced track wear). As such, GE built just 150 B40-8s with Class Is Conrail, Santa Fe, and Cotton Belt/SP purchasing the model. In addition, the AT&SF purchased another 83 units known as the B40-8W, which simply included the wide, safety cab (these still operate on BNSF today). The Santa Fe widely employed this locomotives along its western main lines, particularly in California and New Mexico.

An excellent example of the differences of the B40-8 (right) and B40-8W (left) can be seen here with Santa Fe #555 and #7448 sitting side-by-side in Needles, California. Warren Calloway photo.

It should be noted that Amtrak's large fleet of P40DCs, P42DCs, and P32ACDMs (also known as the Genesis model) is also classified as a variant of the design known as the 8-40BP (typically, however, the locomotives are known by the former names). These models are standard freight locomotives save for their head-end power (HEP) for use in passenger service. In any event, by the time production had ended on the model some 234 units in all had been built (none of which were purchased by foreign lines/companies), not exactly impressive numbers for the now leading locomotive manufacturer.

Santa Fe B40-8W #509 is seen here in Barstow, California during the 1990's. Warren Calloway photo.

GE B40-8/W Production Roster

Owner Road Number(s) Quantity Date Built
General Electric (Demo)800211988
General Electric (Demo)8091 (B40-8W)1988
New York, Susquehanna & Western4002-4048 (Evens)241988-1989
Santa Fe7410-7449401988-1989
Santa Fe500-58283 (B40-8W)1990-1992
St. Louis Southwestern Railway (Cotton Belt/SP)8040-8094551988-1989
U.S. Department Of Energy10711989

Santa Fe B40-8 #7439 grinds upgrade with trailers heading westbound near Dahinda, Illinois on September 7, 1989. Brian Rackley photo.

However, GE would rebound quickly as its C40-8, which debuted in 1988, and wide-cab version (C40-8W) would sell nearly 1,500 units by the mid-1990s. As of today, General Electric has offered no other model with the four-axle design (and neither has EMD) although RJ Corman's RailPower subsidiary, which builds genset and other low-emission, environmentally-friendly switchers still employs the B-B setup with its locomotives. Perhaps, though, one day in the future newer technologies or needs will once again make the four-axle diesel popular within the industry.  Lastly, for more information about the locomotive please refer to the chart above for a complete production roster of the B40-8 as well as its B40-8W variant.

  1. Home
  2.  ›
  3. Diesel Locomotives
  4.  ›
  5. B40-8/W

Header Photo: Drew Jacksich

Researching Rights-Of-Way

A popular pastime for many is studying and/or exploring abandoned rights-of-way.  Today, there are tens of thousands of miles scattered throughout the country.  Many were pulled up in the 1970's and 1980's although others were removed long before that.  If you are researching active or abandoned corridors you might want to check out the United States Geological Survey's (USGS) Historical Topographic Map Explorer.  It is an excellent resource with thousands of historic maps on file throughout the country.  Just type in a town or city and click on the timeline of maps at the bottom of the page!

Studying Diesels

You will be hard pressed at finding a better online resource regarding diesel locomotives than Craig Rutherford's  The website contains everything from historic (fallen flags) to contemporary (Class I's, regionals, short lines, and even some museums/tourist lines) rosters, locomotive production information, technical data, all notable models cataloged by the five major builders (American Locomotive, Electro-Motive, General Electric, Fairbanks-Morse, and Baldwin), and much more.  A highly recommended database!

Electro-Motive Database

In 1998 a gentleman by the name of Andre Kristopans put together a web page highlighting virtually every unit every out-shopped by General Motors' Electro-Motive Division.  Alas, in 2013 the site closed by thankfully Don Strack rescued the data and transferred it over to his site (another fine resource).  If you are researching anything EMD related please visit this page first.  The information includes original numbers, serials, and order numbers.