Siemens S70

Siemens S70
Name	Siemens S70
Caption	Siemens S70 light rail vehicle
Manufacturer	Siemens Mobility
Assembly	Florin, United States
Family	S70/S700
Yearservice	2003
Operator	Valley Metro Rail, RTD Denver, MCTS, SEPTA

Siemens S70 is a series of 70-foot low-floor light rail vehicles built by Siemens Mobility for use on multiple North American and international light rail and streetcar systems. The S70 family evolved from earlier Siemens models such as the Siemens SD-100, Siemens SD-160, and shares lineage with the Siemens U2 and Siemens Combino. It has been procured by transit agencies including Valley Metro Rail, Dallas Area Rapid Transit, RTD (Denver), SEPTA, and MCTS. The design emphasizes low-floor accessibility, modularity, and compatibility with overhead electrification systems deployed across transit networks like Los Angeles Metro, Sound Transit, and VIA Rail corridors.

Design and Technical Specifications

The S70 employs a low-floor articulated body influenced by designs from Siemens Mobility and predecessors such as the Siemens SD-460 and Siemens Avanto. Its bodyshell and truck layout draw engineering concepts from Siemens Combino and Siemens ULF vehicles, while propulsion integrates traction technology comparable to systems on the Siemens Desiro family. The vehicle uses alternating current traction motors with IGBT inverters similar to those in Siemens Velaro high-speed trains and braking systems adapted from Siemens ACS-64 locomotives. The S70 typically runs on standard gauge track used by agencies like MBTA, MARTA, and Cleveland RTA, and collects power via overhead catenary like vehicles on Toronto Transit Commission lines and San Francisco Muni. Accessibility features comply with standards mirrored in rolling stock procured by Amtrak and New Jersey Transit, and interior layouts reflect ergonomic guidelines also used by Metrolinx and Transport for London procurements. Crashworthiness and structural testing reference regulations applied by Federal Transit Administration and safety frameworks akin to those used in National Transportation Safety Board investigations.

Variants and Models

The S70 family includes multiple variants configured for different operators. The original S70 design was adapted into the S700 submodel similar to later procurements for agencies like MCTS and Valley Metro Rail. Custom builds include modified coupler arrangements used by SEPTA and door configurations matching platform heights employed by RTD (Denver), Dallas Area Rapid Transit, and Port Authority of Allegheny County. International adaptations echo changes seen in the Siemens Avenio series used by Helsinki City Transport and Munich U-Bahn procurement standards. Specialized climate packages mirror requirements from operators such as Sound Transit in the Puget Sound region and Vancouver transit agencies, while signaling and communications suit integrations with systems like Positive Train Control implementations in commuter rail by Metra and Caltrain.

Production and Deployment

Manufacturing of S70 vehicles has been undertaken by Siemens Mobility facilities in the United States and European plants with final assembly sometimes occurring in hubs similar to those used for Siemens SD-100 production. Orders have been placed by municipal agencies including Valley Metro Rail in Phoenix, Dallas Area Rapid Transit in Dallas, and RTD (Denver) in Denver; deployments have extended to cities with light rail networks such as Minneapolis–Saint Paul and Salt Lake City. Delivery schedules and commissioning followed procurement processes comparable to those for fleets of Bombardier Flexity and Alstom Citadis vehicles. Financing and grant frameworks utilized funding mechanisms akin to projects financed by the Federal Transit Administration and municipal bonds issued by cities like Portland, Oregon and Sacramento.

Operational Use and Service History

Operators have used S70 vehicles in revenue service on corridors similar to Valley Metro Rail's Central Phoenix/East Valley Light Rail Line, Dallas Area Rapid Transit's DART Light Rail, and RTD (Denver)'s RTD A Line alignments. The vehicles have been integrated into fare and operations environments comparable to those managed by Metrolink (California), WMATA, and Sound Transit with signaling and control interfaces resembling systems in Los Angeles Metro and Hudson-Bergen Light Rail. Maintenance regimes parallel practices at shops like those of SEPTA and MTA divisions, with spare parts logistics coordinated through supply chains used by Siemens Mobility for other fleets such as Siemens SD-160 and Siemens S70 sister models. Service deployments have adapted to seasonal operations and event-driven surges as seen during large gatherings in municipalities like Phoenix, Dallas, and Denver.

Accidents and Incidents

S70 vehicles have been involved in incidents investigated by authorities akin to the National Transportation Safety Board and local transit police divisions similar to those in Phoenix Police Department, Dallas Police Department, and Denver Police Department. Reported occurrences include collisions at grade crossings reminiscent of incidents affecting MBTA and MARTA light rail vehicles, and derailments during infrastructure failures similar to events on systems like San Francisco Muni and Toronto Transit Commission. Investigations typically examine factors comparable to those studied in inquiries into RAIL SAFETY matters, referencing standards and precedents from agencies such as Federal Railroad Administration and Transportation Security Administration when relevant.

Preservation and Legacy

Examples of S70 vehicles serve as reference points in discussions about modern light rail procurement, influencing design choices in later orders by authorities like Valley Metro Rail, Sound Transit, and Dallas Area Rapid Transit. The platform informed subsequent light rail and streetcar procurements alongside models from Alstom, Bombardier Transportation, and Kinki Sharyo. Preserved units and technical documentation are used for training at facilities similar to those operated by SEPTA, RTD, and technical colleges partnering with agencies like National Transit Institute and TransitCenter. The S70's role in expanding light rail networks contributes to urban transit narratives alongside projects such as the Los Angeles Metro Rail expansion, Portland MAX Light Rail, and the revitalization of systems in cities like Minneapolis, Salt Lake City, and Charlotte, North Carolina.

Category:Light rail vehicles