How many express stations were included in the total number of stations for the assignment?

When considering the total number of stations for the assignment, it's important to recognize what "express stations" refers to in the context of train operations. Express stations are typically the stops where express trains do not stop but are included in calculations for routing and scheduling purposes.

In this scenario, selecting the answer that indicates there were three express stations included suggests that these stations play a significant role in the transit system's efficiency and operational planning. The number three can be significant in showing a balance between local and express service, hinting at the complexity of the transit network.

Understanding the criteria for what qualifies as an express station can also shed light on the larger context of how train operators strategize their routes and how passenger flow at these stations is managed. Stations designated as express typically have characteristics such as high passenger volume and act as major transfer points in the network, thus justifying their inclusion in overall station counts during assignments.