In general, the Confederacy was technologically weaker than the Union forces. The Union possessed more than twice the length of railroad trackage that the South had, and while the northern railroads were of standard gauge (meaning that railroad cars could travel seamlessly from one track to another), the southern railroads were not of standard gauge, which complicated railroad travel.
The Union used telegraphs to enable President Lincoln to communicate with troops and leaders in the battlefield, but the Confederacy did not have this capacity. In addition, the Union had repeating rifles, which could fire more than once before they had to be filled again with ammunition. The Confederacy did not have these rifles. However, both the Union and Confederacy had submarines, which the Confederacy used to try to break the Union blockade of southern ports.