Question: What General Electric partnership marketed the Union Pacific GTELs?

Context paragraphs:
GE steam turbine locomotives: The General Electric steam turbine locomotives were two steam turbine locomotives built by General Electric (GE) for Union Pacific (UP) in 1938.  The two units were streamlined, 90 ft in length, capable of producing 2,500 hp , and reputedly able to attain speeds of 125 mph .  Stylistically, they resembled the power units of UP's Pullman-designed M-10003 through M-10006 trainsets and contemporary Electro-Motive Corporation (EMC) diesel designs.

Union Pacific Railroad: The Union Pacific Railroad (or Union Pacific Railroad Company and simply Union Pacific) is a freight hauling railroad that operates 8,500 locomotives over 32,100 route-miles in 23 states west of Chicago and New Orleans.  The Union Pacific Railroad system is the largest in the United States and it is one of the world's largest transportation companies.  The Union Pacific Railroad is the principal operating company of the Union Pacific Corporation (); both are headquartered in Omaha, Nebraska.

Union Pacific Coal Company: The Union Pacific Coal Company was formed in 1874 as the Union Pacific Coal Department by the Union Pacific Railway.  The company was formed because Union Pacific's former coal supplier, Wyoming Coal and Mining Company was selling coal at highly inflated costs to the railroad.

Kansas Pacific Railway: The Kansas Pacific Railway (KP) was a historic railroad company that operated in the western United States in the late 19th century.  It was a federally chartered railroad, backed with government land grants.  At a time when the first transcontinental railroad was being constructed by the Central Pacific and the Union Pacific, it tried and failed to join the transcontinental ranks.  It was originally the "Union Pacific, Eastern Division", although it was completely independent.  The Pennsylvania railroad, working with Missouri financiers, designed it as a feeder line to the transcontinental system.  The owners lobbied heavily in Washington for money to build a railroad from Kansas City to Colorado, and then to California.  It failed to get funding to go west of Colorado.  It operated many of the first long-distance lines in the state of Kansas in the 1870s, extending the national railway network westward across that state and into Colorado.  Its main line furnished a principal transportation route that opened up settlement of the central Great Plains, and its link from Kansas City to Denver provided the last link in the coast-to-coast railway network in 1870.  The railroad was consolidated with the Union Pacific in 1880, and its mainline continues to be an integral part of the Union Pacific network today.

Union Pacific / North Line: The Union Pacific / North Line (UP-N) is a Metra line in the Chicago metropolitan area.  It runs between Ogilvie Transportation Center and Waukegan, Illinois, with rush-hour trains continuing to Kenosha, Wisconsin.  Although Metra owns the rolling stock, the trains are operated by the Union Pacific Railroad.  (Metra does not refer to its lines by particular colors, but the timetable accents for the Union Pacific/North line are dark "Flambeau Green".  The colors came from the company colors of the Chicago & North Western Railway, while "Flambeau" refers to the C&NW's "Flambeau 400" passenger train.)  This line was known as the Chicago & Northwestern/North Line until C&NW was absorbed by Union Pacific circa 1995.

Union Pacific 4014: Union Pacific 4014, or UP 4014, is a four-cylinder articulated 4-8-8-4 Big Boy-type steam locomotive owned by Union Pacific Railroad.  4014 was retired from service on July 21, 1959, and donated to the Railway & Locomotive Historical Society in Pomona, California, in December 1961.  The locomotive reached its destination in January 1962 and was displayed in Fairplex through 2013.  Thereafter, Union Pacific 4014 was moved to Union Pacific's Steam Shop in Cheyenne, Wyoming, where it is now being extensively restored back to running condition.  When 4014 returns to running condition, it will displace UP 3985 as the largest, heaviest and most powerful operational steam locomotive in the world.

Union Pacific 844: Union Pacific 844 is a 4-8-4 "Northern" type steam locomotive built by the American Locomotive Company in December 1944 for the Union Pacific Railroad.  Constructed as a member of the FEF-3class of 4-8-4's, the 844 was the last steam locomotive delivered to Union Pacific.  Though the FEF-3 class was originally built for high-speed passenger work, 844 and the rest of the FEF-3 class were pressed into a variety of dual-service work.  While commercial Union Pacific steam operations ended in the late 1950s, 844 was retained by the railroad for special activities.  Today, it is one of UP's oldest serving locomotives, as well as the only steam locomotive never retired by a North American Class I railroad.

Union Pacific GTELs: Union Pacific operated the largest fleet of gas turbine-electric locomotives (GTELs) of any railroad in the world.  The prototype, UP 50, was the first in a series built by General Electric for Union Pacific's long-haul cargo services and marketed by the Alco-GE partnership until 1953.  The prototype was introduced in 1948 and was followed by three series of production locomotives.  At one point, Union Pacific said, GTELs hauled more than 10% of the railroad's freight.

Central Branch Union Pacific Railroad: The Central Branch Union Pacific Railroad was a railroad in the U.S. state of Kansas.  Originally planned as a line from Atchison west into Colorado, and given federal land grants by the Pacific Railway Act of 1862 as one of the branches of the Union Pacific Railroad, it was left with a hanging end at Waterville, Kansas when the Union Pacific Railway, Eastern Division, with which it was to connect, changed its route.  The line was acquired by the Union Pacific through a stock purchase by Jay Gould and leased to the Missouri Pacific Railroad in 1880.  In 1909 the Central Branch was merged into the Missouri Pacific; the latter company came back into the Union Pacific system in 1982.  In 1991 the remaining trackage west of Frankfort was leased to the Kyle Railroad.

Alco-GE: Alco-GE was a partnership between the American Locomotive Company and General Electric that lasted from 1940 to 1953.  Their main competitor was EMD.  Under this arrangement, Alco produced the locomotive body and prime mover, and GE supplied the electrical gear.  Alco management could see that the market for steam locomotives would soon vanish, and General Electric was interested in getting into the lucrative diesel locomotive market.

Supporting paragraphs: Union Pacific GTELs Alco-GE
Answer: Alco-GE