mainlines in English
noun
1
a popular name for a series of affluent suburbs west of Philadelphia in Pennsylvania, along the old Pennsylvania Railroad main line.
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1. An Articulated locomotive is a steam locomotive (rarely, an electric locomotive) with one or more engine units that can move independent of the main frame.Articulation allows the operation of locomotives that would otherwise be too large to negotiate a railroad's curves, whether mainlines or special lines with extreme curvature such as logging, industrial, or mountain railways.