Simplify the following text for a Grade 11 native English-speaking person.
Original: Interstates 81 and 70 , CSX , Norfolk Southern , and the Winchester and Western railroads , and Hagerstown Regional Airport form an extensive transportation network for the city .
Simplified: Interstates 81 and 70 , CSX , Norfolk Southern , and the Winchester and Western railroads , and Hagerstown Regional Airport cross in the city .