It's a Tactical issue actually. 1st Engine arrives and pulls about 2 houses down, or a reasonable distance which allows the 1st due Truck access to front of the building to raise the main ladder instead of throwing up ground ladders and reports their location after the Engine reports ("Truck xx Sector A"). 2nd Engine secures a secondary hydrant down the block, and then backs down the block so they're facing the same direction as the 1st due Engine. That's how it's "supposed" to work.
On high-rise fires, you hear the OEMC designate the 3rd Engine. ("Engine XX, you are the 3rd due Engine") They have a specific assignment, one of which is lobby control, hooking up to the stand pipe etc.
For CFD, there is a method to the madness for everything. On larger scale events, OPS-10 is used for companies to report to the Command Van when they arrive at the Staging Area. EMS Command (Channel 6), and EMS OPS-7 (Channel 7-Simplex Only), are used on incidents at the Field Chief's discretion.