The TRA DR3000 series diesel multiple unit is an air-conditioned diesel passenger car introduced by the Taiwan Railways Administration (TRA) in 1990, the third air-conditioned diesel multiple unit type operated by TRA. It was manufactured by Hitachi. In the early 1990s, despite the DR2800 and DR2900 series already operating Tze-chiang services on the eastern main line, tickets were still extremely difficult to obtain. Combined with the upcoming opening of the South Link Line, the need for additional rolling stock became urgent. On December 23, 2020, electrification of the South Link Line was completed across its full length, leaving no unelectrified sections on Taiwan's circular railway main lines. Combined with the gradual delivery of the new EMU3000 electric multiple units beginning in 2021, the operational need for diesel Tze-Chiang services diminished. After the timetable change on April 26, 2023, the DR3000 series was officially retired, ending 33 years of service on Taiwan's eastern main line.
Background
History of introduction Among the ten major construction projects of Taiwan in the 1970s, the construction of the North Link Line became one of the most important railway projects of the era. It connected Nanshenhu StationNow Su-ao New Station. on the Yilan Line with Hualien Station, opening officially in February 1980. Subsequently, in July 1982, the Taitung Line completed a gauge conversion from 762 mm to 1,067 mm, making the Yilan Line, North Link Line, and Taitung Line the primary railway trunk lines in eastern Taiwan.
In the early 1990s, the existing DR2800 and DR2900 diesel multiple units could no longer meet the continuously growing passenger demand on the eastern main line. With the imminent opening of the South Link Line, the need for additional rolling stock became pressing. The decision was therefore made to purchase diesel multiple units of the same specifications as the DR2900 series from Hitachi of Japan as supplementary stock. In order to address the operational shortfall at once, 27 sets totaling 81 vehicles were ultimately procured, making this the largest single purchase of diesel passenger cars in to date. Since the vehicle design was largely identical to the DR2900 series, the numbering was originally intended to continue the DR2900 series sequence; however, as the number of cars was too large and would result in duplicate numbering, the type designation was changed to DR3000 for power cars and DR3070 for generator trailers. Although Hitachi was awarded the contract for the DR3000 series, it in fact subcontracted the construction of 15 vehicles to Kawasaki Heavy Industries and Tokyu Car Corporation without disclosing this to TRA; this was only revealed to TRA through a foreign railway magazine half a year after all vehicles had been delivered, and the matter was subsequently referred to the Control Yuan for censure.
Operational history After multiple trial runs and preparation, the trains entered service on December 18, 1990,The source states 1900, which is a typographical error for 1990 in the original. operating under the "Tze-Chiang" name on the eastern main line. Initially, because the DR3000 series was control-system-compatible with the DR2800 series, the two types were routinely coupled together in regular service. However, because the braking systems of the DR2800 and DR3000 series differed, coupling caused a jerking sensation during braking; consequently, after 2000, combined operation of the two types became rare except on consecutive holidays. The DR2900 and DR3000 series, having nearly identical braking systems without any jerk, were routinely coupled together instead. After the South Link Line opened on January 12, 1992, the service area expanded to the Western Line north section (to Shulin), the South Link Line, the Pingtung Line, the Western Line south section, and the Mountain Line (to Taichung). In 1998, service was extended to Fengyuan. With the late-1990s , the operating section was changed to run between Shulin and Taitung. After 2000, the DR2900 and DR3000 series began sharing a common pool for coupled operation. On July 16, 2014, electrification of the entire Taitung Line was completed. With the addition of Puyuma Express trains on the eastern main line, some direct express services began to be operated by TEMU2000 sets. In 2015, electrification of the Pingtung Line between Pingtung and Chaozhou was completed; however, as electrification between Chaozhou and Fangliao had not yet been finished, services over the unelectrified section used the DR2900 or DR3000 series. After electrification was completed in 2019, these services switched to . From October 16, 2016, following the opening of elevated tracks under the , the gap between the new platform edges and the car doors was excessive, leading to the complete withdrawal of the DR3000 series from Mountain Line services; the southern terminus was changed to Changhua on the Western Line south section.
On December 23, 2020, electrification of the South Link Line was completed across its full length, leaving no unelectrified sections on Taiwan's circular railway main lines. Combined with the gradual delivery of the new EMU3000 electric Tze-Chiang express trains beginning in 2021, the operational demand for diesel Tze-Chiang services disappeared, and the number of scheduled workings was drastically reduced. The DR3000 series therefore began to be taken out of service rather than undergo overhaul upon reaching each Class A maintenance interval. From the timetable change on March 29, 2022, operating workings were reduced to just two sets: one assigned to commuter trains for staff at the , operating two round trips between and Chaozhou Station Monday through Friday; and the other assigned to regular passenger services, operating 13 workings on the eastern main line and South Link Line between Shulin, Hualien, Zuoying, and Changhua. On June 29 of that year, services were further reduced to 10 workings, and on November 17 reduced again to only 6 workings. After the timetable change on April 26, 2023, the DR3000 series was officially retired, ending 33 years of service on Taiwan's eastern main line. On the day of retirement, TRA specially operated train No. 6688 from Shulin to Hualien as a farewell event. Throughout those 33 years, mechanical failures were rare; even when a failure occurred en route, the train was generally able to complete its journey and return to the depot under its own power without needing assistance.
Specifications and construction
Car body Taking into account Taiwan's warm and humid climate, the car body of the DR3000 series was constructed of stainless steel, with a design identical to that of the DR2900 series. The window design features large windows alternating with small windows. DR3000 series trains were fitted with an electric tablet catcher guard in front of the escape door to prevent the tablet from striking the car body and causing noise or damage due to inertia at high speed; the original tablet guard has since been removed. Behind this guard is an emergency escape door, enabling rapid passenger evacuation in the event of an accident. The passenger boarding doors are located at the rear end of the car, while the DR3070 series has boarding doors at both ends of each car. New vehicles were fitted with manual folding doors, but beginning in 2009, to prevent passengers from falling out due to an improperly closed door, the DR3000 series was progressively modified by the Nanzhou plant of Chinyang Corporation, primarily replacing the folding doors with sliding plug-type electric doors.The emergency door was not modified because its conversion would require changes to the interior design. This improved both convenience and safety by reducing the risk of accidents caused by doors left unclosed. Because jumper cables for the automatic door interlock system had to be installed, the external appearance at the car ends changed slightly: the number of inter-car jumper cables increased from two to three, the position of the tail lights shifted slightly upward, and the electrical tail light bracket moved from above the tail light to beside it. The livery is identical to that of the DR2900 series: the front end features a warning color scheme to alert pedestrians, and yellow and orange stripes are applied along the upper and lower edges of the windows to increase visibility and enhance passenger sense of safety. The DR3000 series carried the TRA emblem above the car number from new, so in the early years the only way to distinguish a DR3000 from a DR2900 at a distance was by the emblem on the car body.
The side destination indicator on the trains was originally a roller blind type installed above the doors. To allow for greater flexibility in displayed content, when the doors were renewed in 2009 the indicators were replaced with tri-color LED displays, relocated from above the doors to above the center section of the car body. The space above the doors previously occupied by the roller blind destination indicator was repurposed for the automatic door mechanism; the LED displays are of the same type as those used on the DR2800 series.
Passenger saloon The interior design of the DR3000 series is essentially the same as that of the DR2900 series. The aisle is carpeted, the walls are finished with wood-grain paneling, and the seats are reversible reclining chairs identical to those used on Chu-Kuang trains, arranged in a 2+2 configuration with a seat pitch of 1,100 mm. There are 11 rows of 22 pairs of seats, totaling 44 seats. In July 2003, following the , the four seats adjacent to the emergency door were removed, reducing seating to 40. The DR3070 generator trailer has no toilet, only a simple galley area, allowing more seats to be installed: 14 rows on the odd-numbered side and 13 rows on the even-numbered side due to the galley, totaling 54 seats. Above the seats are luggage racks; the design differs considerably from that of the DR2900 series in that a metal rail guard is fitted along the outer edge of the rack to prevent luggage from sliding off. The DR3000 series has green guard rails, while the DR3070 series has orange guard rails. Below the windows, a cup holder is installed beside each seat. The interior features arch doorways similar to those of the DR2700 diesel passenger cars, within which heat piping and exhaust pipes are routed, with metal decorative panels adorning the arches. The aisle carpeting was later removed to simplify maintenance and procurement. The DR3000 power car has a separate driver's cab on the left side of the train, partitioned from the saloon by a small divider panel; on the opposite side of the cab is a two-person reversible reclining seat which, separated from the general passenger area by a partition and offering a forward view of the track ahead, became colloquially known as the "King's Seat" (天王座). This seat was generally used as the conductor's rest area or as a rest space for on-board maintenance staff. The DR3070 series, having no driver's cab, has no equivalent "King's Seat" section.
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