GE "U33B" Locomotives: Specs, Roster, History
Last revised: January 2, 2025
By: Adam Burns
The U33B was the fourth, and most powerful, 4-axle road switcher the company offered up
until that time. When introduced in 1967, however, the industry was moving away from four-motored road-switchers.
The U30C, and Electro-Motive's SD40 series, convinced railroads that high-horsepower, six-motored designs were the future in road service work.
As Greg McDonnell notes in his book, "U-boats," the U33B was not actually meant as a stand-alone model but rather a continuation of the earlier U30B.
Most orders for were taken by one railroad, Penn Central, although a handful of other lines did purchase it as well including the New York Central (a pair of upgraded U30Bs), Seaboard Coast Line, and Rock Island.
Today, all of the original 137 examples of the U33B have been retired and none are preserved.
Photos
Penn Central U33B #2859 (built as New York Central #2859 in September, 1967) is seen here at the 59th Street Yard in Chicago on April 9, 1970. Roger Puta photo.History
The U33B began production in September, 1967. As Mr. McDonnell notes, the model was merely a continuation of the earlier U30B.
Interestingly, the original four U30B demonstrators, #301-304, were returned to Erie, Pennsylvania in the early summer of 1967.
During this time the builder upgraded the locomotives with an additional 300 horsepower available to the traction motors, which boosted total output to 3,300 horsepower.
In doing so, a larger rear radiator assembly was required. This "winged" look became a trademark of GE locomotives, and continues today under successor Wabtec Freight.
The four locomotives emerged in July still wearing largely the same black livery but with the addition of a bright yellow nose. These changes aside, the U33B was virtually identical to its earlier counterpart.
It sported the same boxy carbody and straightforward appearance of the Universal line. The U33B utilized the builder's standard 4-cycle model 7FDL16 prime mover.
All other specifications of the locomotive was also mimicked the U30B: tractive effort, trucks (General Steel Casting Corporation's swing bolster, drop-side equalizers, otherwise known as the AAR Type-B), length, generators, and gearing.
Reception
While some railroads had requested high, short hoods on other U-boat models, all U33Bs were built using GE's standard short, stubby nose.
By the time production had ended in June, 1970 just 137 were sold to four different railroads. Penn Central wound up with the most, 81 units, which continued to see use well into the Conrail era.
As sales for its four-axle designs continued to decline, GE began to phase out the line and offered no more after the U23B finished production in 1977.
Interestingly, the U23B (meant for use in light duty yard and freight service) actually proved a surprising success as General Electric sold more than 400 examples to 17 different railroads and industries.
The U30Bs remained in revenue service through successors Conrail and CSX Transportation through the 1980s but most were off their respective rosters by the early 1990s. The Rock Island's U33Bs were acquired by various buyers following the railroad's 1980 liquidation.
Data Sheet and Specifications
| Entered Production | 9/1967 (New York Central #2858-2859) |
| Years Produced | 6/1967 - 6/1970 |
| GE Class | U33B |
| Engine | 7FDL16 (16 cylinder) |
| Engine Builder | General Electric |
| Horsepower | 3300 |
| RPM | 1050 |
| Length | 60' 2" |
| Height (Top Of Rail To Top Of Cab) | 14' 9" |
| Width | 9' 11" |
| Weight | 254,800 Lbs |
| Fuel Capacity | 1,700 or 2,900 Gallons |
| Air Compressor | 3CDC (Westinghouse) |
| Air Brake Schedule | 26NL (Westinghouse) |
| Trucks | B-B |
| Truck Type | Swing Bolster, Drop-Side Equalizer (GSC) or Floating Bolster FB2 (GE) |
| Truck Wheelbase | 9' 4" |
| Wheel Size | 40" |
| Traction Motors | 752 (4), GE |
| Traction Alternator | GTA-11AC, GE |
| Auxiliary Generator | GY27, GE |
| MU (Multiple-Unit) | Yes |
| Dynamic Brakes | Optional |
| Gear Ratio | 74:18 |
| Tractive Effort (Starting) | 70,000 Lbs |
| Tractive Effort (Continuous) | 64,000 Lbs at 10.7 mph |
| Top Speed | 70 mph |
Production Roster
| Owner | Road Number | Serial Number | Order Number | Completion Date | Quantity |
|---|---|---|---|---|---|
| New York Central | 2858-2859* | 36397-36398 | 1575 | 9/1967 | 2 |
| Seaboard Coast Line | 1719-1734** | 36467-36482 | 1592 | 12/1967-1/1968 | 16 |
| Rock Island | 290-299 | 36822-36831 | 1402 | 7/1968-9/1968 | 10 |
| Seaboard Coast Line | 1735-1747** | 36837-36849 | 1405 | 1/1969-2/1969 | 13 |
| Penn Central | 2890-2915 | 36868-36893 | 1403 | 9/1968-11/1968 | 26 |
| Penn Central | 2926-2935 | 36929-36938 | 1411 | 11/1968 | 10 |
| Penn Central | 2916-2925 | 36939-36948 | 1411 | 11/1968-12/1968 | 10 |
| Penn Central | 2936-2955 | 36949-36968 | 1411 | 12/1968 | 20 |
| Rock Island | 285-289 | 36969-36973 | 1431 | 1/1969 | 5 |
| Rock Island | 190-199 | 37128-37137 | 1440 | 5/1969 | 10 |
| Penn Central | 2956-2970 | 37396-37410 | 1456 | 5/1970-6/1970 | 15 |
* Built as part of New York Central's fleet of U30B's numbered 2830-2889 these units, which even sported builder's plates denoting them as U30B's, were actually U33B's according to Greg McDonnell's book "U-boats."
The units were distinguished by their wider rear radiators, needed to support the higher horsepower output.
** Rode on trade-in Blomberg trucks.
Sources
- Foster, Gerald. A Field Guide To Trains. New York: Houghton Mifflin, 1996.
- Marre, Louis A. Diesel Locomotives: The First 50 Years, A Guide To Diesels Built Before 1972. Milwaukee: Kalmbach Publishing Company, 1995.
- McDonnell, Greg. U-boats. Toronto: Stoddart Publishing, 1994.
- Pinkepank, Jerry A. Diesel Spotter's Guide. Milwaukee: Kalmbach Publishing Company, 1967.
- Solomon, Brian. GE Locomotives: 110 Years Of General Electric Motive Power. St. Paul: MBI Publishing, 2003.
The history of General Electric's "U-boat" line is fascinating. From a macro view it is viewed as a success and helped propel GE into the lead as a locomotive manufacturer by the 1980's.
Railroads generally regarded them as reliable, easy to maintain, and offering a variety of new, innovative technologies. However, from a micro view, crews loathed U-boats.
The locomotives provided a notoriously rough ride. These issues were largely corrected in the "Dash" series (7, 8, 9) of the 1980s/1990s.
In an interesting twist, one can still find rebuilt Electro-Motive models from the 1960's on Class I rosters today while nearly all early U-boat variants have either been scrapped or now reside in museums.
Recent Articles
-
Amtrak’s Southwest Chief – Complete Scenic Route Guide 2026
Jul 16, 26 04:39 PM
The Southwest Chief is one of Amtrak’s classic long-distance trains and one of the best ways to experience the American West by rail. -
U.S. Rail Traffic Shows Continued Strength in Week 27 Of 2026
Jul 16, 26 11:52 AM
The Association of American Railroads (AAR) released its weekly rail traffic report on July 15, 2026, covering data for the week ending July 11, 2026 (Week 27). -
DL&W's Tavern-Lounge Observation Cars
Jul 15, 26 10:06 PM
The tavern-lounge-observation cars on the Delaware, Lackawanna & Western Railroad’s (DL&W) Phoebe Snow were signature tail-end cars (numbered 789 and 790), not built by Pullman but by the Budd Company… -
B&O Railroad Museum Rebrands
Jul 15, 26 03:23 PM
The historic B&O Railroad Museum, long celebrated as a cornerstone of American railroad heritage, announced on July 14, 2026, that it is changing its name to the National Museum of Railroad History… -
Amtrak’s Empire Builder – Complete Scenic Route Guide 2026
Jul 15, 26 12:56 PM
Complete 2026 guide to Amtrak’s Empire Builder. Route overview, best scenic sections, schedules, what to expect, and tips for riding this iconic long-distance train through the northern United States. -
Washington ~ Wine Tasting ~ Train Rides
Jul 15, 26 11:39 AM
Here’s a detailed look at where and how to ride, what to expect, and practical tips to make the most of wine tasting by rail in Washington. -
Kentucky ~ Wine Tasting ~ Train Rides
Jul 15, 26 11:37 AM
Kentucky, often celebrated for its rolling pastures, thoroughbred horses, and bourbon legacy, has been cultivating another gem in its storied landscapes; enjoying wine by rail. -
Best THE POLAR EXPRESS™ Train Rides Across the United States 2026
Jul 15, 26 11:04 AM
Discover the best THE POLAR EXPRESS™ Train Rides in the US for 2026. Top locations, what to expect, dates, and tips for this magical holiday experience based on the beloved story. -
Indiana ~ Murder Mystery ~ Dinner Train Rides
Jul 15, 26 09:20 AM
This piece explores the allure of murder mystery trains and why they are becoming a must-try experience for enthusiasts and casual travelers alike. -
Ohio ~ Murder Mystery ~ Dinner Train Rides
Jul 15, 26 09:14 AM
The murder mystery dinner train rides in Ohio provide an immersive experience that combines fine dining, an engaging narrative, and the beauty of Ohio's landscapes. -
Arizona ~ Wild West ~ Train Rides
Jul 15, 26 09:06 AM
Let's delve into the captivating world of Arizona's Wild West train adventures, currently offered at the popular Grand Canyon Railway. -
Michigan ~ Wild West ~ Train Rides
Jul 15, 26 08:49 AM
While the term 'wild west' often conjures up images of dusty plains and expansive deserts, Michigan offers its own unique take on this thrilling period of history. -
Amtrak’s Coast Starlight – Complete Scenic Route Guide 2026
Jul 14, 26 02:24 PM
Complete 2026 guide to Amtrak’s Coast Starlight. Route highlights, best scenic sections, schedules, what to expect, and tips for riding one of America’s most beautiful long-distance trains. -
Best Steam-Powered Scenic Train Rides in the Eastern U.S. 2026
Jul 14, 26 01:21 PM
Discover the best steam-powered scenic train rides in the Eastern U.S. for 2026. From Cass Scenic Railroad Shays to Strasburg and other heritage steam operations — schedules, highlights, and tips. -
Indiana - Beer Tasting - Train Rides
Jul 14, 26 12:34 PM
On select dates, the French Lick Scenic Railway adds a social twist with its popular Beer Tasting Train—a 21+ evening built around craft pours, rail ambience, and views you can’t get from the highway. -
Wisconsin ~ Wild West ~ Train Rides
Jul 14, 26 12:10 PM
Through a unique blend of interactive entertainment and historical reverence, Wisconsin offers a captivating glimpse into the past with its Wild West train rides. -
Georgia ~ Wild West ~ Train Rides
Jul 14, 26 11:46 AM
Nestled within its lush hills and historic towns, the Peach State offers unforgettable train rides that channel the spirit of the Wild West. -
Florida ~ Wine Tasting ~ Train Rides
Jul 14, 26 11:34 AM
Wine by train not only showcases the beauty of Florida's lesser-known regions but also celebrate the growing importance of local wineries and vineyards. -
Texas ~ Wine Tasting ~ Train Rides
Jul 14, 26 10:05 AM
This article invites you on a metaphorical journey through some of these unique wine tasting train experiences in Texas. -
New Mexico ~ Wine Tasting ~Train Rides
Jul 14, 26 09:26 AM
For oenophiles and adventure seekers alike, wine tasting train rides in New Mexico provide a unique opportunity to explore the region's vineyards in comfort and style. -
Tennessee ~ Murder Mystery ~ Dinner Train Rides
Jul 14, 26 09:10 AM
Amidst the rolling hills and scenic landscapes of Tennessee, an exhilarating and interactive experience awaits those with a taste for mystery and intrigue. -
California ~ Murder Mystery ~ Dinner Train Rides
Jul 14, 26 09:01 AM
When it comes to experiencing the allure of crime-solving sprinkled with delicious dining, California's murder mystery dinner train rides have carved a niche for themselves among both locals and touri… -
North Carolina ~ Wild West ~ Train Rides
Jul 13, 26 01:49 PM
North Carolina, a state known for its diverse landscapes ranging from serene beaches to majestic mountains, offers a unique blend of history and adventure through its Wild West train rides. -
Pennsylvania ~ Wild West ~ Train Rides
Jul 13, 26 01:45 PM
The Keystone State is home to a variety of historical attractions, but few experiences can rival the excitement and nostalgia of a Wild West train ride. -
New York ~ Wine Tasting ~ Train Rides
Jul 13, 26 01:40 PM
This article will delve into the history, offerings, and appeal of wine tasting trains in New York, guiding you through a unique experience that combines the romance of the rails with the sophisticati… -
Michigan ~ Wine Tasting ~ Train Rides
Jul 13, 26 01:35 PM
In this article, we’ll delve into the world of Michigan’s wine tasting train experiences that cater to both wine connoisseurs and railway aficionados. -
Illinois ~ Murder Mystery ~ Dinner Train Rides
Jul 13, 26 01:32 PM
Among Illinois's scenic train rides, one of the most unique and captivating experiences is the murder mystery excursion. -
Vermont ~ Murder Mystery ~ Dinner Train Rides
Jul 13, 26 01:28 PM
There are currently murder mystery dinner trains offered in Vermont but until recently the Champlain Valley Dinner Train offered such a trip! -
The Flying Scotsman’s American Adventure: LNER 4472’s U.S. Tour
Jul 13, 26 12:02 PM
In the fall of 1969, a gleaming British steam locomotive unlike anything most Americans had ever seen rolled into Boston and spent the next four years touring the U.S. -
Amtrak's California Zephyr – Complete Scenic Route Guide 2026
Jul 12, 26 01:04 PM
Explore Amtrak’s California Zephyr, one of America’s most scenic long-distance train routes. Complete 2026 guide with highlights, best times to ride, what to expect, photography tips, and fall foliage… -
Alabama ~ Wild West ~ Train Rides
Jul 12, 26 12:25 PM
Although Alabama isn't the traditional setting for Wild West tales, the state provides its own flavor of historic rail adventures that draw enthusiasts year-round. -
Indiana ~ Wine Tasting ~ Train Rides
Jul 12, 26 12:22 PM
In this article, we'll delve into the experience of wine tasting trains in Indiana, exploring their routes, services, and the rising popularity of this unique adventure. -
South Dakota ~ Wine Tasting ~ Train Rides
Jul 12, 26 12:04 PM
For wine enthusiasts and adventurers alike, South Dakota introduces a novel way to experience its local viticulture: wine tasting aboard the Black Hills Central Railroad. -
New Mexico ~ Murder Mystery ~ Train Rides
Jul 12, 26 11:41 AM
Among Sky Railway's most theatrical offerings is “A Murder Mystery,” a 2–2.5 hour immersive production that drops passengers into a stylized whodunit on the rails. -
Michigan ~ Murder Mystery ~ Dinner Train Rides
Jul 12, 26 11:36 AM
Among the lesser-known treasures of this state are the intriguing murder mystery dinner train rides—a perfect blend of suspense, dining, and scenic exploration. -
Best Christmas and Holiday Train Rides in the Eastern U.S. 2026
Jul 12, 26 11:05 AM
Discover the best Christmas and holiday train rides in the Eastern U.S. for 2026, including Polar Express experiences, Santa trains, and festive scenic journeys. Plan your magical rail adventure this… -
New York ~ Wild West ~ Train Rides
Jul 12, 26 09:53 AM
Join us as we explore wild west train rides in New York, bringing history to life and offering a memorable escape to another era. -
Ohio ~ Wild West ~ Train Rides
Jul 12, 26 09:38 AM
For those enamored with tales of the Old West, Ohio's railroad experiences offer a unique blend of history, adventure, and natural beauty. -
Western Pacific's 4-6-6-4 "Challengers" (M-100)
Jul 11, 26 11:29 PM
In the late 1930s, the Western Pacific stood at a crossroads. Traffic volumes were recovering from the Great Depression, and the railroad needed more powerful, faster locomotives to move longer freigh… -
Cass Scenic Railroad Fall Foliage Trips 2026 – Complete Guide
Jul 11, 26 04:28 PM
Plan your 2026 fall foliage trip on the Cass Scenic Railroad. Complete guide to the Bald Knob route, schedules, what to expect, photography tips, and why this West Virginia steam train ride is one of… -
Best Fall Foliage Scenic Train Rides in the Eastern United States 2026
Jul 11, 26 03:16 PM
Discover the best fall foliage train rides in the Eastern U.S. for 2026. From steam-powered mountain climbs in West Virginia to scenic heritage railroads across the Appalachians and beyond — plan your… -
Missouri ~ Wild West ~ Train Rides
Jul 11, 26 11:27 AM
In Missouri, a state rich in history and natural beauty, you can experience the thrill of a bygone era through the scenic and immersive Wild West train rides. -
Indiana ~ Wild West ~ Train Rides
Jul 11, 26 11:17 AM
Indiana offers a unique opportunity to experience the thrill of the Wild West through its captivating train rides. -
North Carolina ~ Whiskey Tasting ~ Train Rides
Jul 11, 26 11:05 AM
One of the GSMR's most distinctive special events is Spirits on the Rail, a bourbon-focused dining experience built around curated drinks and a chef-prepared multi-course meal. -
West Virginia ~ Wine Tasting ~ Train Rides
Jul 11, 26 10:45 AM
West Virginia, often celebrated for its breathtaking landscapes and rich history, offers visitors a unique way to explore its rolling hills and picturesque vineyards: wine tasting trains. -
Utah ~ Wine Tasting ~ Train Rides
Jul 11, 26 10:42 AM
Utah, a state widely celebrated for its breathtaking natural beauty and dramatic landscapes, is also gaining recognition for an unexpected yet delightful experience: wine tasting trains. -
Virginia ~ Murder Mystery ~ Dinner Train Rides
Jul 11, 26 10:12 AM
Among the state's railroad attractions, murder mystery dinner trains stand out as a captivating fusion of theatrical entertainment, fine dining, and scenic travel. -
Maryland ~ Murder Mystery ~ Dinner Train Rides
Jul 11, 26 10:02 AM
Maryland is known for its scenic landscapes, historical landmarks, and vibrant culture, but did you know that it’s also home to some of the most thrilling murder mystery dinner trains? -
U.S. Rail Traffic Surges 8.7% in Holiday Week Ending July 4, 2026
Jul 10, 26 03:39 PM
Despite the Independence Day holiday (which fell on a Saturday), U.S. freight railroads delivered an impressive performance, posting an 8.7% year-over-year increase in total traffic -
APSL Nears Acquisition Of B&O Depot In Paw Paw, WV
Jul 10, 26 11:44 AM
After decades of quiet abandonment, a dedicated preservation effort by the Allegany Preservation Society Limited (APSL) is racing to secure its future— having already raised approximately 90 percent o…
%20is%20seen%20here%20at%20the%2059th%20Street%20Yard%20in%20Chicago%20on%20April%209%2C%201970.%20Roger%20Puta%20photo.){kind=link}