A brilliant alternative to thin,

softwood decking, that is full of character. These hefty hardwood railway sleepers will last for decades and provide a perfect entrance to a building, or patio space. Sturdy, durable and strong enough to support the weight of a visiting elephant or sociable hippopotamus.
https://www.railwaysleepers.com/projects/decking-patios-with-railway-sleepers/solid-wooden-decking-using-reclaimed-tropical-hardwood-railway-sleepers