This was quite an interesting event that happened recently in Scotland: https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_d

This was quite an interesting event that happened recently in Scotland: https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/676754/180111_R012018_Markinch.pdf https://assets.publishing.service.gov.uk/government/uploads/... Basically the train lost the ability to brake and effectively rolled backwards and forwards over a 4.7 mile section of track, with gradients on either end, until it came to a stop in the lowest section of the line see page 11).