âTime is running outâ: Calls to upgrade Caulfield Station before Metro Tunnel opens Weâre sorry, this service is currently unavailable. Please try again later. Dismiss Save Normal text size Advertisement Caulfield Station could become a major bottleneck once the $13.7 billion Metro Tunnel is built in 2025, if multimillion-dollar upgrades to construct a new concourse do not go ahead. The Victorian Transport Action Group is calling for up to $70 million worth of upgrades to the second-busiest station outside the city, arguing Caulfield Station could face overcrowding if the need for better interchange facilities is overlooked. Caulfield train station. Credit:Paul Jeffers