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The original 4000-series commuter trains—a unique chapter in Odakyu’s history—were created during Japan’s period of rapid economic growth to address severe overcrowding. They were produced through a process of "car-body renewal," which combined equipment salvaged from older trains with newly constructed, larger car bodies.
Key Features and Overview
• Car-body renewal using recycled components
These trains utilized traction motors and control equipment salvaged from older, smaller 16-meter-long rolling stock (such as the "HB" and "ABFM" series). This equipment was installed into newly built, 20-meter-long, four-door steel car bodies, modeled after the state-of-the-art 2600-series trains of that era. This approach allowed for a significant increase in transport capacity at a relatively low cost.
• A mismatch: "Nose-suspension drive" and "Pioneer" bogies
When first introduced, the trains featured a retro "nose-suspension drive" system—known for the deep, rumbling sound it produced—paired with "Pioneer Type III (P-III)" bogies. These cutting-edge bogies, which featured air suspension and externally mounted brake discs, created a striking contrast with the older drive system. This unusual combination remains well-known among railway enthusiasts.
• Major upgrades: Air conditioning and "high-performance" conversion (from 1985)
Initially non-air-conditioned, the fleet underwent an extensive renewal program starting in 1985. During this process, the trains were retrofitted with equipment salvaged from other retiring series (such as the 2400-series "HE" cars), transitioning them to a "cardan drive" (WN-drive) system—the standard for modern trains—and finally adding air conditioning. The original bogies were also replaced with more conventional types, transforming these units into high-performance trains capable of operating in multiple-unit consists with other commuter rolling stock. Later Years and Retirement
• As one of the "faces of Odakyu"—characterized by a white livery with a royal blue stripe—these trains served a wide range of roles, from express to local services, across lines such as the Odawara and Enoshima lines. Following the introduction of the second-generation 3000 series, which served as their successors, these trains concluded their regular scheduled service in December 2004, and by January 2005, the entire fleet had been retired.
1. Origins (1970s–): A Time of Separate Formations
The 6-car trainset known as "4260F" did not exist in that configuration from the beginning. Originally, the cars were built as separate 5-car and 3-car sets.
• The original cars (including Kuha 4260)
In the 1970s, as the 4000 series fleet was expanded to help alleviate congestion, new trainsets—such as the 5-car "4011F" and 3-car "4008F"—were constructed using equipment salvaged from older, retired rolling stock.
At that time, the trains utilized a traditional "nose-suspension" (or "axle-hung") drive system—known for the deep, rumbling sound produced during operation—and lacked air conditioning.
2. Major Reconfiguration (1988): Reorganized into "4260F"
In the late 1980s, a project was launched to retrofit the 4000 series with air conditioning and upgrade them to a modern, high-performance cardan drive system. To improve operational efficiency, Odakyu moved away from the existing 5-car + 3-car configuration, opting instead to reorganize the fleet into 6-car and 4-car sets.
This process led to the creation of the 6-car "4260F," which was formed through a highly unique combination:
• It was based on the original 5-car "4011F" set. • A single intermediate car, taken from the dismantled three-car "4008F" set, was inserted into the formation.
• This created a six-car train, and the lead car on the Shinjuku end was assigned the new number "4260."
*Note: The remaining four cars from the original set were combined with other units to form a four-car train (the 4056F set).
3. Upgrading to High-Performance: The Long-Awaited Addition of Air Conditioning and a "Hidden Feature" Unique to the 4260F
During this reconfiguration, the train was fitted with powerful motors and equipment salvaged from retired express trains (such as the 2400-series "HE" cars). This transformed it into a "high-performance, modern local train"—remarkably quieter and equipped with air conditioning.
This major overhaul also resulted in a unique, niche feature found only on the 4260F:
• A Secret in the Running Gear (Bogies)
Typically, the high-performance lead cars of the 4000-series were equipped with "TS-814" model bogies. However, the lead cars of the 4260F (including car 4260 itself) were fitted with "TS-818" model bogies—a different type repurposed from surplus intermediate cars.
If you look closely at the undercarriage in the photograph, you may notice that the components, such as the braking system, differ slightly from those on other 4000-series lead cars.
Later Years and a Lasting Legacy
As the final six-car set (the last in the series) to be created, the 4260F—following its high-performance upgrade—gained the ability to be coupled with other commuter trains, such as the 5000 and 8000 series. It went on to see extensive service, operating across a wide range of roles, from express trains to local all-stop services. Following the introduction of a new train series (the second-generation 3000 series), the 4260F set was retired and dismantled in 2004, bringing its tumultuous history to an end.
However, the legacy of those complex, mixed-and-matched configurations lives on in the modern "second-generation 4000 series." Having learned from the difficulties of piecing together the original 4000 series from disparate units, the second-generation 4000 series was built from the outset as standardized, fixed 10-car trainsets—a design that now plays a vital role in the railway's through-service operations.
The Secret Behind the "Hon-Atsugi" Destination Display Font
As of March 2004, the "Hon-Atsugi" destination display on the front of the 4260F almost certainly used the traditional, slightly bold Gothic-style typeface—a hallmark of the Odakyu line.
While many subsequent train models transitioned to displays featuring English text or LED screens, the 4260F retained its classic, highly legible, and character-rich font until the very end. Even with its modern front-end appearance—complete with a pilot (skirt)—it still held a subtle, nostalgic trace of the Showa era.
Bonus Facts
• Always Paired with "Other Trains"
During that period, express and semi-express services were increasingly operated as 10-car trains. Since the 4260F was only a 6-car set, it could not operate alone; it was always coupled with a 4-car set—such as another 4000-series unit, or a 5000- or 8000-series train—to form a complete 10-car consist.
• The Secret of the "Window" Behind the Driver's Cab
If you look closely at the lead car, "4260," you may notice a narrow, vertical window located just behind the driver's cab—positioned between the crew door and the first passenger door. In fact, since this window design was discontinued in the later 5000 and 8000 series, it remained a distinctive, retro feature of the 4000 series (which featured a body based on the 2600 series) right up until the end of its service life.
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My friend Matt brought round his brand new SRS tubular exhaust manifold for his b16 Honda Civic SiR.
I like shiny things :D
Had a go at lighting it with the Alien Bee 800, used clamps to mount it in front of the background so I could get at various angles, with the intention to build the collage above :)
Photos have had little to no editing, slightly increased the "clarity" in camera raw & that is it :D
Gorgeous piece of kit which I imagine will be put to work on Matts Civic pretty soon!