This workshop contains the airlock entrance that allows Big Daddies and other workers in deep sea diving gear to access the Depot. This airlock connects to a locker room for the suits and gear of the divers, and it is followed by a pipe line for packages and mail and a small office with tool supplies. After that there is the Workshop that contains train cars suspended for repair, and several drafting rooms.

This workshop is adjacent to the Drafting Rooms and receives the Train Cars from Workshop 6A. In this section the train cars were prepared for departure. This area also contained a small diner, the Railway Cafe, in which the workers could relax and eat between shifts. Workshop 6B could be divided into two separate sections by lowering a massive door down in the center of the chamber. The raising and lowering of this door was conducted by levers and gears inside a nearby Control Room booth.

The elevator travels up through many levels of the Atlantic Express Depot until it exits into an upper room with a small office, most likely from a manager of the depot. This area connects to the waiting lounge of the Train Station, with a Cafe for visitors and staircase leading to the ticket booth and departure area.