The Abt Rack and Pinion System

Someone who didn't know that Abt was the name of the guy who invented the system suggested an acronym for ABT of 'Alternate Biting Teeth' which describes it exactly! There were a number of similar systems, as below, but Dalat, Furka, Nilgiri and Snowdon all use Abt.

From article in The Railway Magazine. January 2016

 Below are a selection of photos of the Abt System

Exhibition at Snowdon Mountain Railway. Note much smaller rails and cogs and guard rail at either side of cogs

The only rack left on the Dalat line! At Dalat Station

Under freight wagon at Furka

Exhibition at Mettapalaiam on the Nilgiri line

Me and my cogs at Hillgrove Station on the Nilgiri line

Exhibition at Mettapalaiam on the Nilgiri line

Exhibition at Mettapalaiam on the Nilgiri line

Exhibition at Mettapalaiam on the Nilgiri line

Cogs at Coonoor

Spring-loaded rack at Coonoor ensured cogs engage with loco