Jon Searles' photos with the keyword: rack

Here's a closeup of the tracks, with the cog in the middle.

Here's a better look at one of the steam locomotives.

Here's the extreme grade to the summit. I don't actually precisely what it is. Some particularly ambitious people were jogging to the summit alongside the tracks.

The Snowdon Mountain Railway, while only 4.7 miles long, is so steep that it's a cog railway. It's also 2'7.5" narrow-gauge. Built in 1896, it is still partly steam powered. Here you can see both steam and diesel power. The terminal at the bottom of the mountain is at Llanberis, which is also a station on the Llanberis Lake Railway and the Carnarvonshire Railway. The Summit station is integrated into the cafe mentioned earlier.

This EMU is, if I'm not mistaken, a ABDeh 8/8 Class, although the Wikipedia page seems to lack a comprehensive photo collection to go with the list of classes. For that matter, the Wikipedia article lacks even a roster.

This is one of my better shots of the train, which was an EMU like most of what the BVZ runs.

Here's a look at one of the more moderate grades in the world to use a cog. I took this seconds after Picture 1.

Many cog (or rack) railways in Switzerland, and for that matter the world, only use cog technology for banking, running conventionally. The BVZ Zermatt-Bahn is one such railway.