dr Cassandra Nojdh skrev: ↑måndag 07 juni 2021 7:47
Vad gäller Tvärbanan så påstår jag att det faktum att man kör (eller avser att köra) på sk. sikt på Kistagrenen är en ren besparingsåtgärd, även om det spunnits in i en massa ideologiproduktion av typen "såhär kör man spårväg" i beslutet.
San Francisco: Muni Metro’s Train Control Upgrade Supported By State Grant
Railway-News skrev:The grant, awarded through California’s Solutions for Congested Corridors programme, will help replace outdated control technology and expand automated management of Muni Metro services beyond the subway system.
The current train control system runs on technology from the 1990s and is only active within subway sections. On-street services depend on manual operation and line-of-sight driving. The upgrade will introduce Communications-Based Train Control (CBTC), which uses wireless signals to monitor and manage train locations and movements across the network.
[...]
The project, known as the Train Control Upgrade Project (TCUP), is being rolled out in phases. The first section to receive the upgrade will be between Embarcadero Station and Mission Bay. This work is expected to be completed in 2028. A separate phase covering all subway sections is scheduled to begin in 2026, with completion anticipated in 2030. The remaining street-level segments are due to follow, with all phases projected to finish by 2032.
Muni Metro blir världens första spårväg att få CBTC. Spårvägar kan alltså ha moderna signalsystem, speciellt från
Hitachi. Snart får alla säga farväl till
floppyn:
Ars Technica skrev:The Muni Metro’s Automatic Train Control System (ATCS) has required 5¼-inch floppy disks since 1998, when it was installed at San Francisco’s Market Street subway station. The system uses three floppy disks for loading DOS software that controls the system’s central servers. Michael Roccaforte, an SFMTA spokesperson, gave further details on how the light rail operates to Ars Technica in April, saying: “When a train enters the subway, its onboard computer connects to the train control system to run the train in automatic mode, where the trains drive themselves while the operators supervise. When they exit the subway, they disconnect from the ATCS and return to manual operation on the street." After starting initial planning in 2018, the SFMTA originally expected to move to a floppy-disk-free train control system by 2028. But with COVID-19 preventing work for 18 months, the estimated completion date was delayed.
[...]
Beyond the floppies, though, the Muni Metro needs many more upgrades. The SFMTA plans to spend $700 million (including the $212 million Hitachi contract) to overhaul the light rail's control system. This includes replacing the loop cable system for sending data across the servers and trains. The cables are said to be a more pressing concern than the use of floppy disks. The aging cables are fragile, with "less bandwidth than an old AOL dial-up modem," Roccaforte previously told Ars. The SFMTA is reportedly planning for Hitachi to start replacing the loop cables with a new communication system that uses Wi-Fi and cellular signals for tracking trains by 2028. However, the SFMTA's board of supervisors still needs to approve this, the Chronicle said.
Inte ens gröna linjens proprietära system från Siemens - SL:s
åldrande flaggskepp -
håller måttet jämfört med senaste CBTC-tekniken. Såhär kör man spårväg!