The railroad in the U.S.:

 Best Friend of Charleston, 1830
total mileage in the United States:
1830 1840 1850 1860 1870
canals 1277 3326 3698

railroad     73 3328 8879 30,636 50,000

In the 1820s and 1830s the technology had not yet stabilized
history of rail profiles
relationship between the railroad and slavery

The telegraph

Better transportation and communication meant slaves were sold further away from their families
their communication networks and strategies couldn't keep up with technology
as commerce became more impersonal, networks were of less value
It seems as though, with every technological advancement, slaves are empowered in one way, and dehumanized further in another."