David, yards are a very personal thing and every model RR has differant requirements according to the master plan of its owner for operations.
There are alot of examples of yard types out there and these can be seen by doing a google image search, checking modelers trackplans etc,but you will in the end have to design one to fit your area and your needs.
Learn about yards,thier components, tracks and why they are laid out the way they are. This will go a long ways in helping to understand how a freight yard is designed.
Now based on what you said above you actually have several yards within one large yard that you would like to have.
You have your passenger yard area and you have your freight yard area.
within the freight yard you have the need of a couple of yards.
Your through freight yard with east and west staging, and you local yard.You may also want an interchange track which could become almost another yard in itself.
You also have your servicing facility which will eat up alot of real estate based on a 9 stall roundhouse, Icing facilities,fueling,sanding,water,wash racks,backshops,yard towers and division point offices.
Based on your radius's i'm guessing this is HO (you havent said which scale exactly) and this type of facility is going to be huge and realistically would need to be accessed from both sides as the width will be greater than you can comfortably reach and deal with coupling,uncoupling ,switch maintenance and track maintenance.
Perhaps a penninsula with an out and back design and provision for continuous running should be considered.
Seperating the freight and passenger yards completely is another consideration.
Do you have and have you read Freight Yards by Andy Sperandeo??
If you havent,I reccomend getting it. While it isnt authoritative, it is a good overview of yards and thier layouts and why yards are laid out the way they are.Also what all those tracks are and what they do.
Having that room sketch would really help along with a bit more information.
NYC syracuse area in the late fifties would have seen a serious decline in passenger trains.Icing facilities were likely no longer being operated and if they were it was on a much declined basis.( I doubt they were still in use)
By mid 1955 Pacific fruit express had 39,000 mechanical refrigerated cars in service and ice platforms were nearing thier end.
Also , Steam in the late 50's on a mainline was almost non existent.Even regionals had gone diesel by then with few exceptions (a few heavy commodity roads,coal, ironore still ran some steam for ore turns and dock switching).
It sounds to me as if 1949-1951 may be a better target date for you but then again, it is your railroad
