The Abt system was devised by Roman Abt, a Swiss locomotive engineer working for a Riggenbach-equipped line, as an improved rack system. The Abt rack features steel plates mounted vertically and in parallel to the rails, with rack teeth machined to a precise profile in them. These engage with the locomotive's pinion teeth much more smoothly than the Riggenbach system. Two or three parallel sets of Abt rack plates are used, with a corresponding number of driving pinions on the locomotive, to ensure that at least one pinion tooth is always engaged securely. Download high resolution version (2048x1536, 705 KB) Wikipedia does not have an article with this exact name. ... Download high resolution version (2048x1536, 705 KB) Wikipedia does not have an article with this exact name. ... Carl Roman Abt ( 16 July 1850 - 1 May 1933, Lucerne) was a Swiss mechanical engineer who invented the Abt rack system for rack railways. ...
The Strub system is similar to the Abt but uses just one row of wider rack plate. It is the simplest rack system to maintain and has become increasingly popular.
The Abtrack and pinion system was devised by Roman Abt, a Swiss locomotive engineer working for a Riggenbach-equipped line, as an improved racksystem.
Two or three parallel sets of Abtrack plates are used, with a corresponding number of driving pinions on the locomotive, to ensure that at least one pinion tooth is always engaged securely.
The Strub system, invented by Emil Strub, is similar to the Abt, but uses just one wide rack plate welded on top of a flat bottom T railway rail.
The Riggenbach racksystem, invented by Niklaus Riggenbach, is the oldest form of rack railway and uses a ladder rack, formed of steel plates or channels connected by round or square rods at regular intervals.
This system is sometimes known as the Marsh racksystem, because of simultaneous invention by an American inventor, Sylvester Marsh, builder of the Mount Washington Cog Railway.
The Von Roll racksystem, by the von Roll company, is similar to the Abtsystem, except that the teeth in the single blade are cut to suit the gear geometry of either the Riggenbach system cog or the Strub system cog (or gear) wheels.
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