2 thoughts on “Why?”

  1. It is cheap, durable, and keeps vegetation to a minimum. Once its set, it is resistant to damage caused by the vibration of passing trains and, even better, it is immune to frost damage. If and when it needs to be replaced, removing it is easier than alternatives like tarmac or concrete. Last, but not least, it’s self cleaning through rain (any non-solid materials will eventually wash through it). Not a bad attribute if you remember that most train toilets flush straight onto the tracks.

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