MP36PH-3S

MP36PH-3S is a diesel-electric passenger locomotive built by MotivePower Industries, intended for commuter rail operations replacing aging fleets and meeting emissions standards. It combines a high-power prime mover with head-end power capabilities and was designed for agencies seeking modern traction with crashworthiness and multiple-unit control. The model saw service across North American commuter systems and influenced subsequent designs for hybrid and genset locomotives.

Design and development

The MP36PH-3S was developed by MotivePower Industries following requests from agencies such as Sound Transit, Metra, Caltrain, GO Transit and Amtrak for a 3,600 horsepower locomotive with head-end power and updated crashworthy cab design. Early design work involved collaboration with suppliers including Electro-Motive Diesel, Cummins, MTU Friedrichshafen, and Westinghouse Electric Company to meet Environmental Protection Agency Tier 2 emissions rules and interoperability expectations with Bombardier Transportation and Stadler Rail rolling stock. Prototype fabrication drew on structural engineering standards used by Federal Railroad Administration regulations and incorporated interoperable multiple-unit control systems compatible with equipment from Knorr-Bremse and Wabtec Corporation. The program sought to balance tractive effort used on services operated by Washington Metropolitan Area Transit Authority and New Jersey Transit with weight restrictions common on corridors like the Northeast Corridor and commuter lines serving Chicago Union Station and Los Angeles Union Station.

Technical specifications

The MP36PH-3S uses an Electro-Motive Diesel 12-cylinder two-stroke diesel prime mover rated at approximately 3,600 horsepower connected to an alternator powering AC traction motors supplied by vendors such as Siemens Mobility and Alstom. The locomotive includes head-end power generation for passenger auxiliary loads, dynamic braking systems with resistor grids modeled after designs from General Electric subsidiaries, and microprocessor-based controls from GE Transportation or Wabtec. The underframe and cab structure follow crashworthiness approaches informed by Association of American Railroads guidelines and incorporate collision posts and energy-absorbing elements seen in designs by Bombardier Transportation and Stadler Rail. The braking system integrates air brakes with electronically controlled pneumatic features influenced by Knorr-Bremse and adhesion control systems comparable to those in Amtrak and Metra fleets. Fuel capacity, gear ratios, and truck design were optimized for commuter timetables like those on Caltrain and Sound Transit corridors, with multiple-unit capability to work in consists with locomotives from EMD and GE.

Service history

Units entered revenue service in the late 2000s on multiple commuter networks, performing assignments on peak and off-peak runs analogous to services operated by Metra, Caltrain, Sound Transit, and regional operators around Toronto and Vancouver. They were deployed in push–pull operation with bilevel coaches similar to those from Bombardier Transportation and Nippon Sharyo. The MP36PH-3S fleet experienced routine overhauls at heavy maintenance facilities managed by agencies like Amtrak and private contractors such as Progress Rail Services Corporation. Mid-life upgrades included emissions retrofits and positive train control integration to comply with mandates from Federal Railroad Administration and coordinate with systems deployed by Norfolk Southern and CSX Transportation on shared corridors. Operational feedback influenced later MotivePower projects and informed procurement decisions by other agencies including Virginians Railway-style regional operators and transit authorities in metropolitan areas.

Operators and liveries

Primary operators included several North American commuter agencies that applied distinct paint schemes reflecting corporate identities akin to liveries used by Metra, Sound Transit, Caltrain, and Canadian operators like GO Transit and VIA Rail Canada. Some units carried special heritage schemes referencing local history as seen on locomotives operated by Metra and Sound Transit during anniversary events. Maintenance and overhaul contracts were often awarded to contractors familiar with liveries and cosmetic restorations, including firms associated with Amtrak and private shops used by Bombardier Transportation-maintained fleets.

Notable incidents and preservation

A few MP36PH-3S units were involved in collisions and derailments that prompted investigations by the National Transportation Safety Board and local authorities; outcomes led to recommendations resembling those applied in investigations involving Amtrak and Metra equipment. Following retirements or early withdrawal, several examples were preserved or stored by museums and historical groups similar to collectors working with equipment from Railway Preservation Society of Ireland-style organizations and North American rail museums near Chicago and Seattle. Preservation efforts emphasized restoration of cab safety systems and cosmetic liveries, often coordinated with volunteers experienced in restoration projects for equipment from Nippon Sharyo and Bombardier Transportation.

Category:Diesel-electric locomotives Category:Passenger locomotives