Question: The Brookville BL20CG is a diesel-electric locomotive built by which organization, it uses three Cummins QSK-19 engines, Cummins, Inc. is an American Fortune 500 corporation that designs, manufactures, and distributes engines, filtration, and power generation products?
Context: Cummins Inc. is a corporation of complementary business units that design, manufacture, distribute and service engines and related technologies, including fuel systems, controls, air handling, filtration, emission solutions and electrical power generation systems.  Headquartered in Columbus, Indiana, (US) Cummins serves customers in approximately 190 countries and territories through a network of more than 500 company-owned and independent distributor locations and approximately 5,200 dealer locations.  Cummins reported net income of $428 million on sales of $10.8 billion in 2009. Class M10 is a mainline diesel-electric locomotive built by Diesel Locomotive Works, India, which is the largest diesel-electric locomotive manufacturer in India, for Sri Lanka Railways and constructed in 2012.  M10 is similar in appearance to DLW WDM3D but specifications are somewhat different.  This is one of the longest locomotive types in Sri Lanka.  These Locomotives are for the Sri Lanka Railways as part of the ongoing Northern Railway reconstruction project. The 3GS21B is a low-emissions diesel switcher locomotive built by National Railway Equipment.  It is powered by three Cummins QSK19C I6 engines with each one developing 700 hp and creating a total power output of 2100 hp .  Having multiple engines instead of a single prime mover, a design referred to as a "Genset," reduces overall diesel emissions and improves fuel efficiency.  More than 150 of the 3GS21B Genset locomotives have been produced to date, with the majority of these units being manufactured at NREC's Mount Vernon shops in Southern Illinois.  In addition, three road slug models have also been produced. The Brookville BL36PH is a four-axle diesel-electric locomotive for commuter trains, designed by Brookville Equipment Corporation.  It is built with an MTU 20V4000 V20 engine rated at 3,619 hp to meet EPA Tier 3 emissions standards.  It was the first North American passenger locomotive designed with a 20-cylinder engine since the EMD SDP45 and EMD FP45, originally built in the 1960s.  Head end power is generated by a separate, smaller diesel (Caterpillar C-18) gen-set and is rated at 500 kW .  The outer shell of the locomotive has been designed by Cesar Vergara, who has also designed the outer shells of several other North American passenger locomotives, including the MPXpress and the EMD F59PHI. Delta Valley and Southern 50 is a standard gauge diesel-electric locomotive built by General Electric in May, 1954, GE #32129 for the Delta Valley and Southern Railway.  It replaced a small steam locomotive.  It is of the type designated as a 45-ton, although the actual weight may be different from that.  It is powered by two Cummins HBI-600 six-cylinder diesel prime movers, each of which drives a generator which, in turn, drives a single electric traction motor, one on each truck.  The second axle on each truck is driven by a side rod. The Brookville BL20GH or BL20-GH is a diesel-electric locomotive built by the Brookville Equipment Corporation.  The locomotive is designed for both freight and passenger service.  Brookville built 12 in 2008 for the Metro-North Railroad.  The Staten Island Railway operates four nearly identical BL20G locomotives, built by Brookville in December 2008, in work service. The Brookville BL12CG is a 4-axle diesel-electric locomotive built by the Brookville Equipment Corporation.  The locomotive is designed to meet Tier 4 emissions standards.  The first two were delivered to the Central California Traction Company in April 2015. Cummins, Inc. is an American Fortune 500 corporation that designs, manufactures, and distributes engines, filtration, and power generation products.  Cummins also services engines and related equipment, including fuel systems, controls, air handling, filtration, emission control and electrical power generation systems.  Headquartered in Columbus, Indiana, United States, Cummins sells in approximately 190 countries and territories through a network of more than 600 company-owned and independent distributors and approximately 6,000 dealers.  Cummins reported net income of $1.65 billion on sales of $19.2 billion in 2014. The MPI MP21B is a low-emissions diesel switcher locomotive built by MotivePower Industries.  It is powered by three Cummins QSK19C I6 engines with each one developing 700 hp and creating a total power output of 2100 hp .  One MP21B locomotive has been produced to date, currently operated by Amtrak. The Brookville BL20CG is a diesel-electric locomotive built by the Brookville Equipment Corporation.  It uses three Cummins QSK-19 engines, each rated at 700 hp , for an aggregate of 2100 hp .  The original BL20CG is a rebuilt EMD GP38 which formerly belonged to the Maine Central Railroad and is used by Brookville as a demonstrator.  The BL20CG is a low emissions locomotive.
Answer: Brookville Equipment Corporation