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The lower part of an axle-box which contains an oil reservoir.
Used to lock the rail to its supporting chairs. For bullhead rail a wooden, or metal, wedge is hammered between the outside edge of the rail and chair. For flat bottom rail a sprung steel link is used to hold the flat bottom to the chair.
A staff which incorporates a key for unlocking a points operating mechanism in the middle of a single-line section of track.
The pivot point of a bogie.
Where each side brace of a vehicle underf-rame consists of two diagonal ties connected to a single vertical post, the post is called the "king post".
See also: Queen Post.
A type of steam-locomotive blast-pipe in which the steam jet is split into four streams, and then passed into the chimney via a petticoat pipe divided into four parts.