Alright... @ikas, before I went out last night to celebrate New Year's Eve, I thought my DSD+ was running... and I was wrong. So, as I am typing up this response now, it's been running since about 08:00. The system is pretty busy mainly with encrypted radio traffic.
Before I give you the radio IDs that I was able to pick up, I want to let you know that there's a few different agencies using this trunked system. I know for a fact that the Niagara Regional Police Service, Niagara Parks Police Service, a few fire departments within the region, and allegedly the Canadian Border Service Agency (CBSA) has moved their operations to the system too.
The attached "Niagara Region Radios.txt" can be opened on any computer via Notepad, Notepad++, Visual Studio Code, etc., and it should also be mobile friendly to those who want to take a peek at it from one of those devices. In this document, you will be able to see all 155 radio IDs I picked up, at what time, and to which talkgroup.
Hope this helps!