The T4 Upgrades under consideration were the first stage of what became the More Trains More Services Program. The program of work to address capacity issues initially included:

• STAR Project,
• Hurstville to Sutherland Quadruplication,
• T8 Transformation,
• NIF Project Impacts,
• Hurstville Crossover,
• Sutherland Stabling,
• T4 Station Upgrades.