Dallas, Texas. Dallas ZIP Code Map (Uncolored ZIP3s, Borders Only) :: MapTechnica Classic Series. Our US ZIP Code map shows the uncolored ZIP Code borders in and around Dallas, Texas. This map shows major streets, highways and interstates, and can be printed and displayed as a reference map.
North American railroad signals generally fall into the category of multi-headed electrically lit units displaying speed-based or weak route signaling.orth American signals generally follow a common layout. A high signal consists of one to three heads mounted roughly in a vertical stack, each head capable of displaying one to four different aspects. Automatic signals are identified with a number plate whereas absolute signals are not.
Unit trains are an efficient way to move rock over a railroad for several reasons: 1  First, switching of railcars in intermediate yards is eliminated. 2  Second, the turn around time from origin to destination and return is usually about one half the times of cars in manifest service (shipments of less than 40 cars).