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VetPsychWars (talk | contribs) Changed B unit explanation from "slave" to "booster" because obvious reasons. |
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In the early days of diesel electric MUing there were numerous different systems; some were compatible with one another, but others were not. For example, when first delivered, many [[EMD F-unit|F units]] lacked MU cables on their noses, allowing only for MUing through the rear of the locomotive. That meant that if a train need four locomotives and there were four [[A unit]]s and no [[B unit]]s, a train would require two train crews as the four A units could not be multiple-unit-controlled, except as two groups of two.
Terms used in North America are A unit and B unit where the B or "
Most modern [[diesel locomotive]]s are now delivered equipped for MU operation, allowing a consist (set) of locomotives to be operated from one cab. Not all MU connections are standardized between manufacturers, thus limiting the types of locomotives that can be used together. However, in North America there is a high level of standardization between all railroads and manufacturers using the [[Association of American Railroads]] (AAR) system which allows any modern locomotive in North America to be connected to any other modern North American locomotive.<ref>[http://www.railway-technical.com/us-musp.shtml US Loco MU Control<!-- Bot generated title -->] {{webarchive|url=https://web.archive.org/web/20080201090339/http://www.railway-technical.com/us-musp.shtml |date=2008-02-01 }}</ref> In the [[United Kingdom]] several different incompatible [[Multiple working|MU systems]] are in use (and some locomotive classes were never fitted for MU working), but more modern diesel locomotives used on British railways use the standard [[Association of American Railroads]] system.
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