They are a popular alternatives to trains and are faster but less comfortable than them. As for trains, you will need to buy your ticket in advance and will be given a seat number. Be careful when the bus makes a bathroom stop, the driver don't check if all passengers are on board before resuming driving!
Fares are relatively low, for instance a single from Almaty to Karaganda (14 hours) will cost you 2500T, much cheaper than an flight ticket.
The Most Frequently Asked Travel Questions about Kazakhstan
Where To Stay & Best Hotels in Kazakhstan - updated Apr 2024
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Kazakhstan Travel Guide from Wikitravel. Many thanks to all Wikitravel contributors. Text is available under Creative Commons Attribution-ShareAlike 3.0, images are available under various licenses, see each image for details.