F-line to Dudley via Park wrote:Moves up the Dorchester Branch also only happen at night after commuter rail has stopped, since it requires going through otherwise busy Southampton Yard.
Should container traffic start at Marine Terminal down Track 61, it'll be the same basic overnight job just expanded to nightly instead of on-demand.
First off, when CSXT goes from Readville to The Boston Globe, they DO NOT go through Southampton Street Yard. The normal move is Dorchester Branch to clear Broad Interlocking and then shove west to the Middleboro Main at Cabot and south to The Globe. After switching the Globe there are 3 options for returning to Readville.
1) Pull into "The New Yard" at Fly Interlocking and go down one track, cut the engine away and run around the cars, then pull out onto the Middleboro Main at Fly and shove back to clear Broad and go west via the Dorchester Branch
2) Go from Globe to clear Broad and the shove around the loop and clear South Bay interlocking by the American Cold Storage building. The head west on the Dorchester Branch.
3)Leave The Globe and head north to Broad to the Wye Connector and take the Corridor back to Transfer and shove back into "1 Yard" at Readville.
In regards to container traffic at the terminal, I doubt it will ever happen and there's no long a direct connection between the Dorchester Branch and the lead to 1st Street.