MPI MP40PH-3C

The MP40PH-3C is the third MPXpress Locomotive to be introduced. This unit is rated at 4,000 hp and primarily uses a 16-710G3B prime mover and a CAT C27 engine for HEP. EM2000 microprocessors are used vs. Wabtec Q-tron for MP36's. Engine options include dual Cummins QSK60s, providing a power increase to 5400 hp (designated as MP54AC)
This locomotive is used by both Metrolinx (GO Transit) in Ontario, Canada, as well as Sound Transit in Seattle, Washington, USA.thumb|right|335 px
==Development==
In 2007, GO Transit was looking to expand its fleet, and to replace its roster of ageing F59PH locomotives. The requirements were: to be able to deliver 4000 hp, with a separate engine for the HEP generating system. It also had to be able to pull 12-car trains single handed. Only two manufacturers responded; MPI and GE. MPI's product, the MP40PH-3C, was ultimately selected over a competing design by GE.
GO Transit ordered 27 locomotives of this model to replace their ageing F59PH fleet, which were delivered in 2007 and 2008. An order for 20 additional units was signed in July 2008. They have been delivered. In February 2010, yet another order was signed for 10 additional units. It was announced on November 1, 2011 that GO Transit would be swapping out the EMD prime movers of 11 MP40s for the new Cummins QSK95. The engine swap was recently cancelled. More recently, it was decided that two QSK60s would be installed in lieu of the QSK95. This would provide a power increase to 5400 horsepower and improve emissions to EPA Tier 4 standards. GO would like them repowered before the 2015 Pan-American games.
As of 2016, one MP40PH-3C (unit 647) had the EMD prime mover swapped out and replaced with the two QSK60s. This would become the MPI MP54AC. Instead of sending in more of its MP40PH-3C locomotives, GO Transit has instead decided to order 16 new MP54AC locomotives from MPI. The new units started testing on GO Transit when received in late 2016 and can still be seen in pairs (instead of one unit) on 12-car trains as of 2019, for reasons unknown.
In 2013, GO Transit ordered 10 more units numbered 657-666, initially to replace the remainder of their F59PH fleet (but instead ended up supplementing them), and to expand/increase service on its lines. These locomotives differ from the older (600-656) units because these are Tier-III compliant, as such they feature a noticeably quieter engine as well as a Bombardier regenerative braking system, visible as a thin black "block" above the exhaust section. The locomotives' prime mover and HEP configuration has not changed.
Sound Transit has also placed an order for 3 of these models. They were delivered by 2013, and are used on their Sounder commuter service, alongside their F59PHI locomotives. They are Tier-III compliant.
GO Transit units 607, 615, and 662-666 are currently in the newer "Metrolinx" paint scheme, along with 647 and the rest of the MP54AC fleet. 
==Specs==
While the MP40PH-3C is almost indistinguishable from the MP36PH-3C, there are a few differences:
*The MP40PH only has 2 radiator fans on the top of the unit, as opposed to the 3 fans on the top of the MP36. This is due to the different engine types (16-710G3B vs. 16-645F3B)
*A distinctive howl (on pre-Tier III units)
*(On Tier-IV certified units: Bombardier brake system/silencer mounted above exhaust vents.)
*The MP36PH-3C (not the MP36PH-3S) has extra vents between the radiator and the HEP radiator, yet the MP40 only has them on one side.
The ways to differentiate the MP40PH-3C with the MP54AC are:
* The MP54 has 2 radiators, the first located directly behind the cab, unlike the MP40's single radiator about 3/4 of the way along the locomotive.
* MP40 has 2 dynamic brake fans in the middle of the carbody; MP54 has 1 dynamic brake fan at the rear of the carbody.
* MP54 is significantly quieter than MP40, produces less fumes, being Tier4 compliant and not having a separate HEP generator. 
Specs MP40PH-3C\MP54AC at MetroLinx:
* Length: 68 ft
* Width: 10 ft 7.5in
* Height: 15 ft 6in
* Prime mover: EMD 16-710G3B-T2 (or T3) or dual Cummins QSK60 (MP54AC)
* Power output: 4000 hp or 5400 hp (MP54AC)
* HEP system: CAT C27 HEP engine or invertor off the prime mover (1 of 2) (MP54AC)
* TracionPower: MP40 can pull up to 12 Bombardier BiLevel coaches and the MP54 can pull approx. 14
* HeadEndPower\HEP: capacity for 12\14 BiLevel Coaches
* Couplers: Janney\AARH\APTH\TightLock
==Media==
* PicSearch
* VidSearch
==Refs==
* http://www.motivepower-wabtec.com/locomotives/commuter/mpxpress.phphttp://www.railwaygazette.com/news/single-view/view/cummins-to-produce-tier-4-compliant-diesel-engine.html
* http://www.wabtec.com/upload/pressrelease/09.08.11%20-%20MPI%20Locomotive%20Orders.pdf
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