The location of the incident at the east end of CP-3 within the interlocking had the leading end of the control car fouling the No. 1 track, while the rest of the consist was on the No. 2 track within the interlocking. There would have been nowhere for the trains departing Boston to go to once it went past Lansdowne, express or otherwise. Even the setup of the Newton stops facilitates a single track operation for those stops which are now needed bi-bidirectionally.
At that time, the only equipment west of the incident was the 515-520 consist, but with some magic, the 751's train to Foxboro made it's way to Framingham to have an additional set of equipment on the Worcester line.
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Avatar: An overnight trip on Girard Ave. stumbles upon 6 PCC's and an LRV stuck within two blocks.