The given image delineates a new underground platform called Toronto go train station and its transformation process.
Looking from an overall perspective, it is readily apparent that the process consists of three stages, including before, during, and after construction. In addition, the upper floor of the station remains unchanged throughout the development period.
To commence with, standing at the top of the station is an existing track level, containing a railway for trains as well as specific space for customers and pedestrians. The second part of the station is an existing transit concourse, which has a massive concrete pillar rooted underground in order to elevate the upper floor and also is used to walk by customers. When the station experienced a reinforcement process, the underground witnessed significant changes as builders had cut the pillar in half and the ground was dug for generating a scaffold, which shared the same role of the concrete pillars. During this phase, the general public are not allowed to enter the underground, with the exception of workers and builders.
Regarding the final stage, the whole station was separated into three parts. As the underground had finished its upgrade process, it had an extra floor called new pedestrian retain level, while the old transit concourse had been renovated into the new one, both enabling the station to accommodate more individuals. The opposite was the case for the existing track level, as it still consistently plateaued.