Muni is poised to begin double-train loading and running three-car trains at underground metro stations to speed up boarding and increase capacity on the system’s busiest stretch.

As we reported, Muni began testing double-train loading, a.k.a. “double berthing,” in July, but Transit Director John Haley said the agency hasn’t run tests with actual trains yet. Managers have upgraded the train control software, which Muni says is the main hurdle to allowing two trains to board passengers in a station simultaneously, and run simulations.

“The tests on the software so far have been positive with no bugs or glitches found,” Haley told Streetsblog in an email. “The software and hardware are installed and if the Live Field tests go well we would target Late October / early November to start in service.”

“We think the public will love it,” he added.

Meanwhile, Haley told a Board of Supervisors committee last week that Muni plans to start running three-car trains to make short runs within the underground system only, between the Embarcadero and West Portal Stations, to relieve crowding. Haley said Muni had to work out software kinks to ensure that the third car would communicate with the others, and that those trains should begin running by next month.

Those service upgrades are among eight changes that Haley said Muni operations managers are looking to make. See the rest on the table below.