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1902 . Not only was the design interesting but it smelled strongly of old railway sleepers, too. It appeared the builders used tar to keep the logs from rotting.

It looks like it is built from sleepers.

Indeed it does. That's a terrible idea, by the way. Very unhealthy. Wooden sleepers, utility poles and the like contain creosote for anti-rotting purposes and that stuff is carcinogenic. Definitely not to present code. :)

Yep, we had some old sleepers in an old garden bed that were breaking down heavily and my mother would warn us not to get splinters.