I looked at the NRHFD website and it is number like this station 1 has Engine 221 and station 2 Engine 222 and so on so they must have a new station or has a new engine. Website below
I am not aware of any new engines. I bet it's a reserve. If you find out otherwise, please let me know, and I'll add it to my website. Bedford only has 3 stations, but they have Engine 154 and Truck 154 as reserves for when the front-line apparatus are out of service.
It's either a back up engine in place of a front line engine or an overtime engine placed in service with the weather. We've been placing additional trucks on for the past several days.