Editing 19-inch rack (section)

===Rails (slides)===
Heavy equipment or equipment that is commonly accessed for servicing, for which attaching or detaching at all four corners simultaneously would pose a problem, is often not mounted directly onto the rack but instead is mounted via rails (or slides). A pair of rails is mounted directly onto the rack, and the equipment then slides into the rack along the rails, which support it. When in place, the equipment may also then be bolted to the rack. The rails may also be able to fully support the equipment in a position where it has been slid clear of the rack; this is useful for inspection or maintenance of equipment which will then be slid back into the rack.<ref>William B. George, ''Chassis Slide Mechanism'', {{US patent|3092429}}, granted June 4, 1963.</ref> Some rack slides even include a tilt mechanism allowing easy access to the top or bottom of rack-mounted equipment when it is fully extended from the rack.<ref>Scott F. Herbert, ''Electronic Assembly Chassis Supporting Track'', {{US patent|2809085}}, granted Oct. 8, 1957.</ref>

Slides or rails for computers and other data processing equipment such as [[disk array]]s or [[router (computing)|router]]s often need to be purchased directly from the equipment manufacturer, as there is no standardization on such equipment's thickness (measurement from the side of the rack to the equipment) or means for mounting to the rail.

A rails kit may include a cable management arm (CMA), which folds the cables attached to the server and allows them to expand neatly when the server is slid out, without being disconnected.