I saw an article on this in USA Today. SBB is using sheep instead of lawnmowers to keep the vegetation down along some of the rail lines in Switzerland.
http://blog.sbb.ch/en/2015/05/11/a-day-in-the-life-of-sbb-sheep-bruna/
Thank you, Sam. That was fun to read. Goats are being used more and more for weed control here in Colorado. It's enjoyable watching them do their job.
Cute video! They had been using sheep and goats here in Idaho for weed and brush management but they have decided they may be transmitting pneumonia to the native big horn sheep populations so that grazing has been discontinued.