For the most part the departues would be:
M-F:
Q115 on duty @ 630, usually put together and ready to depart by 715pm.
Q117 on duty @ 715, usually ready to depart around 800/815
Q167, runs most weeknights and departs lite engine, on duty @ 930pm, depart between 945 & 1030.
Q113, on duty at 1030p,m departs around 1115/1130 depending on how many cars or if it's lite engine to Worcester.
Q421 on duty at midnight, unless there is no power for the train in which case it usually goes to work around 800 the next morning. If it goes to work at midnight, usually doubled-up and departing around 100/130am.
Q119 on duty @ 100am, runs lite to Worcester, departing anywhere between 115 & 145am (Tuesday-Saturdays).