EMD F7

EMD F7
D&RGW #5634 in 1950; this early Phase I locomotive was delivered in July, 1949
Power type	Diesel-electric
Builder	General Motors Electro-Motive Division (EMD) General Motors Diesel (GMD, Canada)
Model	F7
Build date	February 1949 – December 1953
Total production	2,366 A units, 1,483 B units
AAR wheel arr.	B-B
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Wheel diameter	40 in (1.016 m)
Length	A unit: 50 ft 8 in (15.44 m) B unit: 50 ft 0 in (15.24 m)
Width	10 ft 7 in (3.23 m)
Prime mover	EMD 16-567B
Cylinders	V16
Power output	1,500 hp (1,100 kW)
Locale	North America

The EMD F7 was a 1,500 horsepower (1,100 kW) Diesel-electric locomotive produced between February 1949 and December 1953 by the Electro-Motive Division of General Motors (EMD) and General Motors Diesel (GMD). It succeeded the F3 model in GM-EMD's F-unit sequence, and was replaced in turn by the F9. Final assembly was at GM-EMD's La Grange, Illinois plant or GMD's London, Ontario facility. Although originally promoted as a freight-hauling unit by EMD, the F7 was also used in passenger service hauling such trains as the Santa Fe's El Capitan.

A total of 2,366 cab-equipped lead A-units and 1,483 cabless booster or B-units were built. The F7 was the fourth model in GM-EMD's successful line of F-unit locomotives, and by far the highest-selling cab unit of all time.

Many F7s remained in service for decades, as railroads found them economical to operate and maintain. However the locomotive was not very popular with the yard crews who operated them in switching service because they were difficult to mount and dismount, and it was also nearly impossible for the engineer to see hand signals from his ground crew without leaning way outside the window. As most of these engines were bought and operated before two-way radio became standard on most American railroads, this was a major point of contention. In later years, with the advent of the “GP” type “road switchers”, Fs were primarily used in “through freight” and “unit train” service where there was very little or no switching to be done on line of road.

The F7 can be considered the zenith of the cab unit freight Diesel, as it was ubiquitous on North American railroads until the 1970s (longer in Canada). The F7 design has become entrenched in the popular imagination due to it having been the motive power of some of the most famous trains in North American railroad history.

The F7 replaced the F3, differing primarily in internal equipment (mostly electrical) and some external features. The F7 was eventually succeeded by the more powerful but mechanically similar F9.

Identification

There are no easily identifiable differences between late F3 production and early F7 production; the major differences were all internal electrical system changes. However, no F7 had the “chicken wire” grilles of most F3s, and no F3s had the later F7 changes described below under Phases.

The EMD F9 is distinguishable from the late F7 by having five, rather than four, carbody center louver groups covering the carbody filters. The additional one is placed ahead of the first porthole, where F7s have no openings. The F9s greater power output, of course, cannot be seen from the outside.

Phases

The identification of locomotive “phases” is a creation of railfans. EMD used no such identification, and instead kept track of the marketing name (F7) and individual locomotives’ build numbers. During the production cycle of a model, EMD would often make detail changes that were not readily apparent to the casual observer. To keep better track of the variations of locomotives identified the same by the manufacturer, railfans began referring to phases (critical changes to a locomotive line).

Despite not being official designations, the phase description is useful. However, many of the changes described are cosmetic, easily changed features of a locomotive: e.g., roof fans, body panels, grilles and the like could be and sometimes were updated or swapped. Most of the phase differences on the F7 were concerned only with A units; B units varied far less. The following are normally identified as F7 phases:

Phase I (early)

Built from February 1949. Upper grille with horizontal openings. Four horizontal louvred openings on center body panel. 36-inch dynamic brake fan, if dynamic brakes fitted. Flush windshield gasket changed to raised in July 1949. Square cab door corners with kick plates on the steps beneath. Wing window short with square corners. Single drip strip over cab windows and door. Square end door window. Round sand filler cover. Rear overhang.

Phase I (late)

Built from March 1950. Upper grille started out horizontal, as in early Phase I; from March 1951, some locomotives were built with vertical-slotted "Farr-Air" grilles, and by October 1951, all had them. Cab doors became round-cornered, and the kick plates were deleted. The wing windows became larger, with round corners. Two drip strips; one over cab windows, second over door. The end door window became round after November 1950.

Phase II

Built from February 1952. All upper grilles vertical "Farr-Air" type. Center car body louvres became vertical-slotted. Sand filler now with a horizontal, rectangular pull handle. From June 1952, 48-inch dynamic brake fans began to be introduced; from October 1952, all dynamic-brake equipped locomotives had them. At that latter date, locomotives no longer had a rear overhang.

The famous paint scheme of the Wabash Railroad, as seen on restored F7A #1189, a Phase II built in 1953. It is located at the Monticello Railway Museum in Illinois.	A Great Northern Railway F7A locomotive in near-pristine condition.	Chesapeake and Ohio Railway F7A #7086, in 1953. This is a late Phase II locomotive built in October, 1952 and is representative of the final year of F7 production.	Soo Line F7A #213B leads a train out of Neenah, Wisconsin in July, 1966.
A 1970's Chicago & Northwestern commuter train powered by F7 411 at the Illinois Railway Museum in 2006

Original buyers

Locomotives built by Electro-Motive Division, USA

Locomotives built by General Motors Diesel, Canada

Preservation

The Escanaba and Lake Superior Railroad's F7A seen on 29 April 2009 while stopped in Channing, Michigan.

• The Escanaba and Lake Superior Railroad (as of April 2009) operates an F7A (#600) in main line freight service. The unit is the former Milwaukee Road #96A, frame number 3073-A1 built January 1951.
• The Western Pacific Railroad Museum at Portola, CA rosters two former Western Pacific Railroad F7As: WP 917-D and 921-D. These engines are part of the museum's popular "Run a locomotive" program. Their roster also includes an FP7 passenger version, WP 805-A.
• The California State Railroad Museum in Sacramento, CA has the former Western Pacific F7A 913. This engine is operational.
• The Fillmore and Western Railway in Fillmore, CA has two F7As that are operational.
• The Monticello Railway Museum in Monticello, IL allows guests to operate their Wabash Railroad F7A #1189 for a donation through the "Throttle Time" program.
• The North Carolina Transportation Museum, Spencer, NC, has former Southern Railway FP-7 6133 in operating condition, with Southern colors.
• The Baltimore & Ohio Railroad Museum, Baltimore, MD, has former Western Maryland Railway F7A 236 in operating condition.
• The Boston & Maine Railroad had 4 F7A's with accompanying B units, numbered 4265-4268 (A & B). #4267A was demolished in a derailment. #4266 survives at this writing, at the Conway Scenic RR in North Conway NH, where it is rostered as a spare unit and operated frequently. It is owned by the 470 RR Club of Portland ME and operated under a lease agreement with CSRR. #4268 is also owned by the 470 Club, and is on static display (exterior only) at CSRR. The prime mover has been removed. #4265 is on static display at the Gorham Historical Society at the former Grand Trunk RR depot in Gorham, NH. It is also inoperable but is being converted into a movie theater/picture gallery with access to the cab.
• The Lake Superior Railroad Museum in Duluth, MN owns a Milwaukee Road F7 Booster unit, 71B. It was used to power a snow plow.
• The Mining Machinery Museum & Park, Port Hedland at Port Hedland has a former Western Pacific Railroad F7A: 923A. This was sold to Mt. Newman Mining and operated as lococmotive 5451 before being transferred to Port Hedland Shire Council[1][2]. This is a static display. The prime mover has been removed.
• The Minnesota Transportation Museum owns Great Northern Railway F7A 454-A, which is painted in Northern Pacific Railway colors, unrestored, and lacking its internal machinery. They also have steam heat car 16, which the Great Northern constructed from F7B 458-B, originally 306-B.

Wikimedia Commons has media related to: EMD F7 locomotives

References

• Fuhrman, Jim. EMD F7 & F9 phases. Retrieved on January 2, 2005.
• Pinkepank, Jerry A. (1973). The Second Diesel Spotter's Guide. Kalmbach Publishing Co., Milwaukee, WI. ISBN 0-89024-026-4. 
• The Western Pacific Surviving Locomotive List [3].
• PRESERVED DIESEL AND ELECTRIC LOCOMOTIVES, John Cleverdon [4].

External links

• Preserved EMD F-Units

See also

• List of GM-EMD locomotives
• List of GMD Locomotives