Information: - An SD40T-2 is a 6-axle diesel-electric locomotive built by General Motors Electro-Motive Division having a 16-cylinder EMD 645E3 diesel engine producing . 312 SD40T-2s were built for North American railroads between April 1974 and July 1980. This locomotive and the SD45T-2 are popularly called tunnel motors, but EMD's term is SD40-2s with "cooling system modifications" because they were designed for better engine cooling in tunnels. The difference between this locomotive and its non-tunnel motor cousin, the SD40-2, are the radiator intakes and radiator fan grills located at the rear of the locomotive. The radiator air intakes in this model were along the deck to allow more fresh, cooler air to enter and less hot exhaust fumes lingering around the tunnel's ceiling. - An EMD GP15AC is a 4 - axle diesel - electric locomotive built by General Motors Electro - Motive Division between November and December 1982 . This locomotive differs from the otherwise identical EMD GP15 - 1 due to Missouri Pacific specifying new AR10 AC alternators instead of rebuilt D32 DC generators . The only external difference between the GP15AC and the GP15 - 1 is a straight side sill ( shared with the EMD GP15T ) not related to the transmission difference . 30 examples of this locomotive model were built for American railroads , with four units built for Venezuela 's IFE . - The EMD 645 family of diesel engines was designed and manufactured by the Electro-Motive Division of General Motors. While the 645 series was intended primarily for locomotive, marine and stationary engine use, one 16-cylinder version powered the 33-19 "Titan" prototype haul truck designed by GM's Terex division. - An EMD GP15T is a 4-axle diesel-electric locomotive built by General Motors Electro-Motive Division between October 1982 and April 1983. It was a very close cousin to the GP15-1, but used a turbocharger in order to generate more power from a smaller engine. Power was provided by an 8-cylinder diesel engine that generated , the same as the GP15-1, but with four fewer cylinders. - The EMD GP15-1 is a 4-axle diesel-electric locomotive built by General Motors Electro-Motive Division between June 1976 and March 1982. Intended to provide an alternative to the rebuilding programs that many railroads were applying to their early road switchers, it is generally employed as a yard switcher or light road switcher. This locomotive is powered by a 12-cylinder EMD 645E engine, which generates . The GP15-1 uses a frame, has a wheelbase of and has a length over couplers of . A total of 310 units were built for American railroads. A number of GP15-1s remain in service today for yard work and light road duty. The radiator section is similar to those found on the EMD SD40T-2 and EMD SD45T-2 "tunnel motors," leading some observers to incorrectly identify the units as such or as GP15Ts, and giving them the nickname "baby tunnel motors". What is the relationship between 'emd gp15ac' and 'emd 645'?
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Answer: powerplant
Information: - A school is an institution designed to provide learning spaces and learning environments for the teaching of students (or "pupils") under the direction of teachers. Most countries have systems of formal education, which is commonly compulsory. In these systems, students progress through a series of schools. The names for these schools vary by country (discussed in the "Regional" section below) but generally include primary school for young children and secondary school for teenagers who have completed primary education. An institution where higher education is taught, is commonly called a university college or university. - A classroom is a learning space, a room in which classes are held. Classrooms are found in educational institutions of all kinds, from preschools to universities, and may also be found in other places where education or training is provided, such as corporations and religious and humanitarian organizations. The classroom attempts to provide a space where learning can take place uninterrupted by outside distractions. - A preschool (also nursery school, pre-primary school, kindergarten outside the US and UK) is an educational establishment or learning space offering early childhood education to children between the ages of three and five, prior to the commencement of compulsory education at primary school. They may be privately operated or government run, and one option is to subsidize the costs. - A student or pupil is a learner, or someone who attends an educational institution. In Britain those attending university are termed "students". In the United States, and more recently also in Britain, the term "student" is applied to both categories. In its widest use, "student" is used for anyone who is learning, including mid-career adults who are taking vocational education or returning to university. When speaking about learning outside an institution, "student" is also used to refer to someone who is learning a topic or who is "a student of" a certain topic or person. - Vocational education is education that prepares people to work in a trade, a craft, as a technician, or in support roles in professions such as engineering, accountancy, nursing, medicine, architecture, or law. Craft vocations are usually based on manual or practical activities and are traditionally non-academic but related to a specific trade or occupation. Vocational education is sometimes referred to as "career education" or "technical education". - Knowledge is a familiarity, awareness or understanding of someone or something, such as facts, information, descriptions, or skills, which is acquired through experience or education by perceiving, discovering, or learning. - A paraprofessional educator , alternatively known as a para , para-pro , paraeducator , instructional assistant , educational assistant , teacher 's aide or classroom assistant , is a teaching - related position within a school generally responsible for specialized or concentrated assistance for students in elementary and secondary schools . Not all countries and states have a fixed definition of '' paraprofessional '' and may use all of the terms listed above , and many others , interchangeably . - A teacher (also called a school teacher or, in some contexts, an educator) is a person who helps others to acquire knowledge, competences or values. - A room is any distinguishable space within a structure. Usually, a room is separated from other spaces or passageways by interior walls; moreover, it is separated from outdoor areas by an exterior wall, sometimes with a door. Historically the use of rooms dates at least to early Minoan cultures about 2200 BC, where excavations on Santorini, Greece at Akrotiri reveal clearly defined rooms within certain structures. What is the relationship between 'paraprofessional educator' and 'occupation'?
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Answer:
instance of