MPI MP8AC-3 explained

MPI MP8AC-3
R156 (New York City Subway)
Powertype:Diesel-electric
Builder:MotivePower
Ordernumber:OL912–OL939
Builddate:2012 - 2013
Totalproduction:28
Aarwheels:B-B
Uicclass:Bo'Bo'
Britishclass:Bo-Bo
Trucks:Kawasaki R156 Fabricated Frame
Wheelbase:36inchesft0inchesin (ftin)
Length:53inchesft3.25inchesin (ftin)
Width:8inchesft8.25inchesin (ftin)
Height:11inchesft5.375inchesin (ftin)
Axleload:290001NaN1
Weightondrivers:100%
Locoweight:1160001NaN1
Fueltype:Diesel fuel
Fuelcap:500USgal
Primemover:Cummins QSK 23G
Rpmrange:600-2100
Enginetype:Inline-6 Cylinder, four stroke cycle diesel engine
Generator:Hitzinger SGS7
Tractionmotors:Siemens SITRAC AC propulsion
2210NaN0 per axle
Cylindercount:6
Cylindersize:3.8583L
Transmission:AC-DC-AC
Maxspeed:300NaN0
Poweroutput:Gross: 8600NaN0
Traction: ~3000NaN0 @ 150NaN0
Tractiveeffort:20250lbf Starting
15000lbf @ 70NaN0
7500lbf @ 150NaN0
4200lbf @ 250NaN0
Trainheating:John Deere 5030HF285, 3.0L, 960NaN0
Locobrakes:Electro-pneumatic
Trainbrakes:Pneumatic
Operator:New York City Subway
Operatorclass:R156
Numinclass:28
Deliverydate:2012 - 2013
Firstrundate:May 1, 2012
Notes:[1] [2]

The MPI MP8AC-3 is a lightweight diesel-electric locomotive built by the MotivePower division of Wabtec. It was designed from scratch as a work train engine for the New York City Subway system, where it is designated the R156.

Description

The R156 is designed to navigate the clearances and tight turns of the NYC Subway, with weight constrained to, so it can operate on elevated portions of the system. It joins a fleet of 62 diesel-electric work locomotives on the system. Third rail power is not used because the third rail is normally turned off at work sites for safety reasons. Instead, the R156 is powered by a 6-cylinder, 800 horsepower Cummins QSK 23 diesel engine.[3] A separate, smaller John Deere Diesel drives a generator to provide auxiliary power and to heat the main engine and keep batteries charged when the main engine is not running. Trucks are supplied by Kawasaki, which provides the same wheel and traction sets for the R160 subway cars. The traction motors are Siemens' SITRAC AC motors (the same ones on R160Bs 8843–9102). The R156 locomotives have provisions for the future installation of communications-based train control (CBTC) equipment, which were expected to be installed by June 2017.[4]

The MTA ordered 28 units in 2006. After some difficulty with the initial prototype, the first unit, numbered OL912, was delivered on May 1, 2012.[5]

Notes and References

  1. News: Diesel locomotives delivered to New York subway . . July 5, 2012.
  2. https://www.wabtec.com/uploads/outlinedrawings/MotivePower8AC-Metro-Work-Locomotive.pdf MP8AC-3 Spec Sheet
  3. Web site: QSK-23 brochure . Cummins.
  4. Web site: MTA 2017 Final Proposed Budget November Financial Plan 2017 – 2020 Volume 2 November 2016. November 16, 2016. mta.info. Metropolitan Transportation Authority. November 17, 2016.
  5. Web site: MTA New York City Transit Takes Delivery of New Diesel-Electric Locomotive . . May 1, 2012 . 1 October 2014.