MRTC 3000 class

The MRTC 3000 class or ČKD Tatra RT8D5M LRV is a first-generation class of high-floor uni-directional light rail vehicles built by Czech tram manufacturer ČKD Tatra. The LRVs are owned by Metro Rail Transit Corporation (MRTC), operated by the Department of Transportation (DOTr) thru DOTr MRT-3, and is currently used on the Manila MRT Line 3. ČKD Tatra RT8D5M LRVs were the last vehicles made by ČKD Tatra before it was taken over by Siemens.

Purchase and production
Construction of the MRT Line 3 began in 1996 when the then-Department of Transportation and Communications (DOTC; later the Department of Transportation) entered into a build-lease-transfer agreement with the Metro Rail Transit Corporation (MRTC). MRTC signed a contract with ČKD Tatra in 1997 to supply the trains.

Aside from a prototype, 73 light rail cars are produced by ČKD in two batches; 49 were produced in 1998 and the other 24 were completed the following year. The first train was flown into Manila via plane while the remaining trains were transported by sea. The fleet also happens to be the last produced by ČKD before it was taken over by Siemens.

Prototype RT8D5 0029
In March 1995 the first three-car tram was tested in Prague under the number 0029 as a prototype. It was a development of the Tatra KT8D5; 0029 retained its control, proportions, the front and rear sections, and unlike the later production vehicles, designed for bidirectional operation. Prototype 0029 remained in Prague and it was used in October to November 1998 together with the Tatra T5A5 prototype, tram no. 0013, and the T3 no. 6663 for various crash tests in the main workshop in Hostivař before being eventually scrapped.

Refurbishments and upgrades
All 73 light rail vehicles (LRV) were first refurbished from 2008 to 2009 by Sumitomo Corporation, its technical partner Mitsubishi Heavy Industries Engineering (MHIENG), and its subsidiary TES Philippines Inc. (TESP). The aging air-conditioning units of the trains since 1999 were replaced with new ones. The interior and exterior of the trains were also refurbished.

In 2016, Busan Universal Rail, Inc. (BURI) initiated the second overhaul of the trains. Forty-three light rail vehicles were to be overhauled as part of its three-year maintenance contract with the Department of Transportation and Communications (DOTC; later the Department of Transportation [DOTr]). The refurbished cars underwent a body repaint and installation of new air-conditioning units from Thermo King. However, DOTr terminated its contract with BURI on November 6, 2017, with only three vehicles refurbished.

When Sumitomo, Mitsubishi, and TESP returned as the line's maintenance providers on May 1, 2019, they continued the second refurbishment of the trains. It consists of the installation of new choppers, traction motors, wheels, pantographs, new air conditioning units from Thermo King (a replacement program for the air conditioning units began as early as 2018); the repainting of the train's exteriors and interiors; and the fitting of new lighting installations throughout the trains. SKD Trade, a. s., the company that produces spare parts for trains made by ČKD Tatra, became part of the overhaul project and provided spare parts. On October 29, 2020, the first newly overhauled train underwent a test run at a speed of 50 km/h. Initially expected to be completed in May 2023, the refurbishment of all 72 light rail vehicles (LRVs) was completed three months ahead of schedule on February 2, 2023.

120 new Thermo King air conditioning units were ordered for 40 LRVs. The installation of the new air-conditioning units on all trains were completed on June 18, 2021.

Four-car operations
Since 2016, plans to operate in a four-car configuration from the current three were laid. On March 9, 2022, a four-car 3000 class trainset underwent a dynamic test run on the main line for the first time. Two four-car trains were deployed on March 28, subsequently increased to four. Although full conversion was initially planned to be achieved by 2023, all trains reverted to the existing 3-car configuration a few months after the months-long free rides ended.

Design
The LRV design is a one-way eight-axle motorized car consisting of three articulated cars, which are connected to each other by the joint and the cover. The RT8D5M operates as built on the high-speed city rail system with high platforms and in tropical conditions.

Car body
The car body is made of low-alloy high-tensile steel, while the ceiling is made of aluminum sheets.

Unlike the prototype 0029, these cars have rounded "foreheads" or beveled large windows at both ends.

The trains wear a livery consisting of royal blue, red, and white. Under the "Metrostar Express" branding, the white portion contains the brand logo and lettering on the sides. However, since 2012, the branding has since been unused. The trains also usually wore wrap ads—unlike the LRTA 1200 class which wear ads as a whole trainset, the 3000 class are seen to wear wrap ads per car.

Each light rail vehicle has three roof-mounted air-conditioning units manufactured by Thermo King. In total, there are nine air-conditioning units in a three-car train set.

LRV 044 used to have experimental exterior lights above the doors in 2017. However, the lights were removed when Sumitomo refurbished and renumbered LRV 044 as 3044 in 2021.

Interior
Each train car has a capacity of 74 seated passengers and 320 standing passengers. Under crush loading conditions, each car can carry 394 commuters at any one time. A 3-car trainset can carry 1,182 passengers. Seats are longitudinal-type.

Each car has five double leaf, electronically operated, plug-sliding doors. The three center doors have an open width of 1,255 mm while the two end doors at 861 mm. The doors have a height of 1,900 mm.

The Passenger Assist Railway Display System (PARDS), a passenger information system powered by LCD screens installed near the ceiling of the train that shows news, advertisements, current train location, arrivals and station layouts, are already installed inside the trains. However, as of 2022, the LCD screens remain switched off. PARDS is also installed on trains on LRT lines 1 and 2.

Mechanical
Each LRV has inside-frame bogies, consisting of four motorized bogies. The primary suspension is a steel spring and the secondary suspension is a wound-up steel spring. Scharfenberg couplers are present in the ends of the light rail vehicles.

Electrical
The electrical and traction systems of the RT8D5M trains are supplied by ČKD Trakce. The propulsion is controlled by choppers with IGBT thyristors. The traction motors consist of eight DC series-wound/wave armature winding self ventilated motors. The traction motors have a Class H insulation class for the rotor and a Class F insulation class for the stator. The motors comply with IEC 349 standards. Each motor has a power output of 64.5 kW. The motors are rated with a voltage of 375 volts, a current of 190 amps, and a speed of 1946 revolutions per minute (rpm) with a maximum speed of 4350 rpm.

Auxiliary power is sourced from 480-volt AC static converters and two 24-volt DC batteries.

Signaling and safety equipment
The trains are equipped with the EBICAB 900 Automatic Train Protection (ATP) system. Some onboard signaling equipment consist of vehicle logic units (VLUs), driver panels, and antennas. The original VLUs were manufactured by Bombardier Transportation (acquired by Alstom in 2021). The VLUs are the primary automatic safety devices for the trains.

In 2017, it was revealed that the original VLUs were stolen and replaced with unauthorized parts. An audit report by Bombardier Transportation showed that 99% of the trains were using fake parts. According to the inventory conducted in all cars, the other cars were equipped with ABB, ABB Daimler-Benz or DaimlerChrysler-branded VLUs.

The EBICAB 900 ATP system is integrated with the Alstom CITYFLO 250 signaling solution.

Train formation
Each unidirectional light rail vehicle consists of three articulated cars.

Incidents

 * On November 3, 2012, a train from the Araneta Center-Cubao Station caught fire as it approached GMA-Kamuning Station, causing passengers to scramble to the exits, and having two women injured. The train caught fire due to electrical short-circuit technical failure.
 * On March 26, 2014, at 10:50 am, a southbound train at Guadalupe Station suddenly stopped due to the train driver not observing the red light status at the Guadalupe Station and accelerated southbound without getting prior clearance from the Control Center, causing the automatic train protection system to activate the emergency brakes, resulting in 10 injuries.
 * On August 13, 2014, a southbound train heading to Taft Avenue station derailed and overshot to the streets. The train first stopped after leaving Magallanes station due to a technical problem. Later on, the train broke down altogether, another train was used to push the stalled train. During this process, however, the first train got detached from the rails and overshot towards Taft Avenue, breaking the concrete barriers and falling to the street below. At least 38 people were injured. The accident was blamed on 2 train drivers and 2 control personnel for failing to follow the proper coordination procedures and protocol.  The A and B sections of the involved train car were loaded sideways onto two flatbed trucks, while the C section of the car was towed to the depot using a hi-rail truck. The train car is still stored at the line's depot in North Avenue as of June 2020. There are currently no news about actions to be taken at the damaged trainset, and was noticeably excluded from train refurbishments.
 * On September 2, 2014, a train continued with one of its doors left open after a train door failed to close at the Guadalupe station. The passengers were then evacuated after the train arrived at Boni station.
 * On September 18, 2017, at 6:00 am, a seat inside 3000 class LRV no. 066 caught fire at the Santolan-Annapolis station with no injuries reported.
 * On November 16, 2017, at 11:30 am, at least 140 passengers were evacuated from a "detached train" coach between the railway lines of Buendia and Ayala Avenue Stations.
 * On January 26, 2018, a train caught fire between the Araneta Center-Cubao and GMA-Kamuning stations. Partial operations were implemented, and the situation normalized at 2:46 pm.
 * On August 7, 2018, an aircon leak caused "rain" inside a train and caused passengers inside to open their umbrellas. The train was removed from service to fix the air conditioning unit and the train involved in the incident returned to service the following day.
 * On November 4, 2019, at 4:08 pm, a train suddenly emitted smoke while on the northbound track of the line. Around 530 passengers were unloaded. Around two hours after the incident, the operation of the line was back to normal. The fire was caused by a short-circuit in the traction motor.
 * On May 12, 2021, 3000 class LRV 015 was vandalized by an unidentified culprit near Taft Avenue station. Investigations were conducted and initial reports state that the culprit had cut the perimeter fence near Taft Avenue station, which may have caused the vandalism. The vandalized train was cleaned and returned to service on May 18, 2021.
 * On October 9, 2021, at 9:12 p.m., 3000 class LRV 032 caught fire near the Guadalupe station. A provisional service was implemented between North Avenue and Shaw Boulevard station, and the site of the incident was declared fire out at 9:51 p.m. As a result of the incident, 8 passengers sustained minor injuries. Normal operations resumed the following day.
 * On November 21, 2021, at 6:51 a.m., a window in a 3000 class LRV was damaged due to a stoning incident, injuring one passenger. The suspect was later identified as a garbage collector and was subsequently arrested and charged.