The Amtrak Centralized Electrification & Traffic Control Center (Amtrak CETC) at South Station controls all south side lines (lines out of South Station). Amtrak controls the NEC, in south station, and in the Southampton yard area, with Keolis controlling all other lines
The Commuter Rail Operations Control Center (CROCC) in Somerville Controls:
All of the Newburyport/Rockport Line
North Station to CPF-WJ on the Haverhill Line
North Station to South Lowell on the Lowell Line
North Station to CPF-WL on the Fitchburg Line
The other parts of these lines are controlled by Pan-Am Railways / CSX in North Billerica. Trains on these portions use the PAR Radio Channels.
With train numbers changing with the opening of SCR, below is a table showing weekday and weekend train numbers.