As my major is Railway Engineering, I am trying to simulate the construction process of a railway station. I mean the construction of railway tracks in the station, not the station buildings.
For example: For simulating the construction process of a turnout, it needs three main things: machine, workforce, and material.
I have used the turnout as a server, and I have used 3 entities coming from 3 resources to the server (the turnout). As the entities arrived the server, it starts processing and its symbol will be changed to green box. I have assigned a turnout symbol for the processing step instead of the green box, and I need to keep this symbol during the whole simulation process as it represents the constructed turnout.