Hi postman,
Hope my thoughts have helped in your research though 1935 is a lot earlier than what I have in mind as I was looking around 1956 onwards as I remember it.
It would have be mostly CLC coaching stock and Great Central Locomotives at that time. In fact you could justify the LNER Sentinel - Cammell steam railcar no 51909 'Waterloo' which was shedded at Northgate from around 1935 it was a replacement for No 51913 'Rival' until 1941 when it was transferred to Leeds. In its time at Northgate it primarily used for a shuttle service to Shotton to connect with North Wales coast trains at Shotton High Level Monday to Friday had a shed day on the Saturdays when the service was booked for a Tank engine and coaches but did two round trips on a Sunday. I seem to remember reading somewhere that these Steam Railcars were also used on the Winsford branch for a short time but it was not successful.
If you look earlier on in the thread there are a couple of shots of the road outside the main station buildings ,the main forecourt always had Crosville Buses parked up probably as an overflow parking area from the main depot which was further down Victoria Rd.
Chester South box which was just by the junction at the station end and Chester East box where pure Cheshire Lines pattern I do have a picture somewhere will dig it out and post it when I can.
The train shed on Peter Denny's Buckingham layout was inspired by Chester Northgate I believe so it might be worth your while tracking down photographs about the layout probably in an old Railway Modeller ,
If I can give you any further information please ask.