Controls
Some "B" units cannot be moved without a controlling unit attached, but most have some simple controls inside, and often a side window at that control station. For example, B unit versions of the EMD FT with conventional couplers had a fifth porthole-style window added on the right side only for the control station. Other models used existing windows. These controls enable a hostler to move the B-unit locomotive by itself in a yard or shops. (A hostler is an employee permitted to move locomotives within the confines of a yard or shops complex, but not on the main railroad.) B units without controls are generally semi-permanently coupled to controlling units. Sometimes, there is a terminology distinction between the types: a booster is a B unit with hostler controls, and a slave is a B unit without hostler controls.
Read more about this topic: B Unit
Famous quotes containing the word controls:
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—George Orwell (1903–1950)
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—Henry David Thoreau (1817–1862)
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—Joan Didion (b. 1934)