This modular station was inspired by a long since expired Cuusso / Ideas project (not mine), and set 4554 Metro Station from 1991. I doubled the model in size and now added a quad-sided clock tower and removable six track long platform. I even put a wheelchair access ramp from the street side for compliance with the Americans with Disabilities Act (ADA).
The track side of the station.
The street side of the station has space for 8 printed 1 x 1 letters, allowing you to name the station what you want along with a statue dedicated to the railroad's founder has been placed by the stairs. As a side not, the four clock faces are supposed to feature this print: www.bricklink.com/v2/catalog/catalogitem.page?P=3960pb037...
The lower floor has the central ticket desk and two inside waiting rooms located under the two left and right wings. These wings also allow for access to the platform under the twin canopies.
Also noticeable in this picture is the removable platform, which connects to the main model via a multitude of Technic pins.
The second floor has the switching control room and station managers office which floats inside the exterior walls on some tile-topped pillars. This assembly is barely connected to the build by two studs.
(NOTE: No stairs to the upper floor were made because that's how the official CITY sets are, so I didn't include any. Besides, it would have messed with symmetry of the station!)