How long will sleepers last in the ground?
Similarly, you may ask, how do you fix railway sleepers to the ground?
Sink the bottom sleepers into the ground to half their depth, drill holes in the sleepers at 1m centres, 25mm wide by 75mm deep. Tap 150mm long dowels into the holes, fix the next layer of sleepers by locking dowels into matching holes. Drill and fix the next layer of railway sleepers.
Additionally, can you lay railway sleepers on soil?
You can also place the sleepers directly on the soil but you might have issues with water pooling around the edges, causing the wood to rot quicker. If you decide to lay them directly on soil, put down a waterproof plastic membrane first to reduce contact with moisture.
Like all wood, sleepers will eventually rot and fade when exposed to the weather. To prevent them falling to bits before their time, you need to use a good wood preserver.