Theories of domestic catâs For decades, many theories have existed to explain the origin of cats. Traditionally, most scholars believed that all domestic cats had a common ancestor in ancient Egypt, where cats were domesticated around 3,600 years ago. Other researchers believed that domestic cats had more than one ancestor, the result of domestication occurring at different times and places, each resulting in a distinct ancestral breed 1.
Railroads usually consider a 100 ft. width of right of way centered about their main track centerline as the minimum on which they can effectively operate. Any encroachment within this limit, even if it is only for ditch cleanout or erosion control, is not welcomed by the railroad and therefore is to be avoided.
Crossrail station platforms will be 250m in length to accommodate 200m trains that will pass through each station, as well as enabling longer 240m trains to operate in the future as passenger demand increases. Dedicated pages are available for each of the central section Crossrail stations.he mock-up of the Crossrail platform section is life sized, measuring 20m in length, 10m in width, with a ceiling height of 5m above the platform-edge doors.