A study released by regional mayors reveals $63.7 billion is needed to keep South-East Queensland moving over the next two decades.

The population of the region is expected to grow by about 1.8 million people to more than 5 million people by 2041, putting more demand on the already strained transport network.

The SEQ People Mass Movement Study lists a total of 47 projects designed to keep city-to-city trips under 45 minutes and urban commutes under 30 minutes, including a faster rail network connecting the Sunshine Coast and Gold Coast via Brisbane and west to Ipswich and Toowoomba.