Class 4

• BR Standard Class 4 2-6-0
• BR Standard Class 4 2-6-4T
• BR Standard Class 4 4-6-0
• British Rail Class 04
• Class 04 (disambiguation)
• Class 4 telephone switch
• Delta class (disambiguation)
• Fourth class (disambiguation)
• Missouri Class 4 city
• NSB Class IV
• NSB Di 4
• NSB El 4
• SCORE Class 4
• TS Class 4
• Truck classification
• Type 4 (disambiguation)
• Yosemite Decimal System