SMRT C751B

The C751B (Contract 751B) is a Singaporean rapid transit electric multiple unit operated by the Singapore Mass Rapid Transit from May 2000 to September 2024 on the North-South and East-West Lines and the Changi Airport Extension.
==History==
The C751Bs were constructed to supplement the existing fleet of C151 and C651 trains for the anticipated opening of the Changi Airport Extension. These began service on 8 May 2000. The C751Bs are capable of being operated on the North-South and East-West Lines at all times, but in practice the entire fleet only operates on one line at a time. The trains were briefly withdrawn from service between April and May 2002 after metal fragments were discovered in the trains's gearboxes. The trains most often can be found operating on the East-West Line and are now an uncommon sight on the North-South Line due to a route map update within these trains as they lack space for a bulb to light up Canberra Station, situated on that line.
The sets were slated to be replaced by R151s, which were introduced into service starting 2023. Withdrawals began in March 2021, starting with set 339/340; the last C751B, 337/338, was withdrawn on 30 September 2024.
==Design==
The sets are made of a double-skinned aluminum alloy, similar to that of the Hitachi A-Train; the train's basic design and fundamentals form the basis of the later C151A, C151B and C151C. These were the first sets on the Singapore Mass Rapid Transit to feature SMRT's then-new corporate livery, with a matte black exterior, red stripe and white cab ends, colloquially known as the "Blackbird" livery. The run numbers are displayed using a MobiTEC MobiLED system on the top right of the cab front. The C751Bs are the first trains on the system to be fitted with a front pilot.
Pre-refurbishment, the sets's route map was a piece of metal with the route information printed on it. These maps were updated to the STARiS route map system progressively from 2009, which feature LED lights to inform passengers of their routes. The second and fifth cars had their middle seats removed and replaced with leaning bars for additional standing space. With the opening of Canberra Station on the network, the STARiS map was updated to reflect this change, although the LED will not light up at Canberra Station due to lack of space and the sets's planned replacement. Depending on the cars each car has magenta, sky blue or teal seats with no difference in shade to differentiate priority seats.
The sets, when built, featured baggage racks, fitting with its intended purpose of plying the Changi Airport Extension. These were quickly removed due to lack of use. Sets of two clusters of four red LED lights, positioned on the sides of each door arch, flash rapidly when the doors are about to close.
==Specifications==
The C751Bs were the first sets on the entire Mass Rapid Transit system to use variable frequency drives; they are so equipped with Fuji Electric 2-level IGBT traction systems which produce a high-pitched whine. This system would be used on all future trains on the North-South and East-West Lines until the R151's introduction.
Kawasaki built 11 sets, while Nippon Sharyo built the remaining 10. Kawasaki built sets 311/312, 315/316, 319/320, 323/324, 327/328 through 333/334, 343/344, 347/348 and 351/352 while Nippon Sharyo built 313/314, 317/318, 321/322, 325/326, 335/336 through 341/342, 345/346 and 349/350.
==Preservation==
The following C751B cars have been preserved:
Car number	Manufacturer 	Date manufactured	Date retired 	Previous sets	Location 	Notes
3320 	Kawasaki Heavy Industries	2000 	March 2023 	319/320 	ITE College West, Choa Chu Kang, Singapore 	Used for student training; not open for public viewing
3321 	Nippon Sharyo 	2000 	November 2023 	321/322 	SAFTI City, Choa Chu Kang, Singapore 	Used for training purposes, not open for public viewing; photography or trespassing onto premises not allowed, lethal force may be used
3322 	Nippon Sharyo 	2000 	November 2023 	321/322 	SAFTI City, Choa Chu Kang, Singapore 	Used for training purposes, not open for public viewing; photography or trespassing onto premises not allowed, lethal force may be used
1322 	Nippon Sharyo 	2000 	November 2023 	321/322 	SAFTI City, Choa Chu Kang, Singapore 	Used for training purposes, not open for public viewing; photography or trespassing onto premises not allowed, lethal force may be used
3345 	Nippon Sharyo 	2001 	November 2023 	345/346 	SAFTI City, Choa Chu Kang, Singapore 	Used for training purposes, not open for public viewing; photography or trespassing onto premises not allowed, lethal force may be used
1345 	Nippon Sharyo 	2001 	November 2023 	345/346 	SAFTI City, Choa Chu Kang, Singapore 	Used for training purposes, not open for public viewing; photography or trespassing onto premises not allowed, lethal force may be used
3326 	Nippon Sharyo 	2000 	June 2024 	325/326 	JTC LaunchPad @ one-north, Queenstown, Singapore	Repurposed to become Train Pod pod hotel; opening September 2024
2317 	Nippon Sharyo 	2000 	September 2024	317/318 	City Square Mall, Farrer Park, Singapore 	Repurposed to become CDL EcoTrain educational exhibit; opening fiscal 2024
==Gallery==
C751B Interior.jpg|Interior
C751B STARiS.jpg|STARiS route map
C751B Beacon.jpg|Door closing lights
C751B Screen.jpg|Deactivated LCD screen
C751B KS Plate.jpg|Builder's plate (Kawasaki)
C751B NS Plate.jpg|Builder's plate (Nippon Sharyo)
C751B 3326 2024.jpg|3326 in June 2024, undergoing conversion to a pod hotel
Category:Electric trainsets
Category:Kawasaki locomotives
Category:Nippon Sharyo locomotives
Category:Mass Rapid Transit trains