Hitachi Rail STS plans, designs, manufactures, installs and commissions signaling systems, components and technologies for the management and control of newly built or upgraded railways, transit and freight lines worldwide.

Providing design, manufacture, installation, integration and maintenance of a wide range of train control systems and equipment, Hitachi Rail STS employs 4,327 people worldwide as of 2018.

[7] In Europe, Ansaldo STS expanded acquiring the French company Compagnie des Signaux pour Chemins de fer (CSE) in 1996.

[12] In the occasion of the Ordinary General Shareholders’ Meeting on 2 November, Hitachi Rail Italy Investment completed the acquisition of the 40% of the share capital of Ansaldo STS.

Major projects involving Hitachi Rail STS and its predecessor companies include the Copenhagen Metro, where it is responsible for the provision of rolling stock, Automatic Train Control, SCADA and other services;[22] and signalling on LGV Est in France and High Speed 1 in the United Kingdom.

[22] The company also managed projects for signalling, train control and/or maintenance for the Metro systems of Paris,[23] Los Angeles, Rome,[24] Milan,[25] Hong Kong, Naples, Shenyang,[26] India,[24] and Thessaloniki.

[citation needed] As of 2013 over half of all high speed lines worldwide (excluding Japan) are equipped with Hitachi Rail STS signaling.

OTP is an advanced planning engine that solves complex logistics problems under changing operating conditions to maximize capacity and increase average velocity.

Computational agents respond in real-time to updated CAD and field data, issuing new movement plans that account for current conditions and all operating rules and constraints.

[citation needed] The company provides on-board and wayside components and systems, such as interlocking (MicroLok II), track circuits, switch machines (M-style), traditional and LED signals, Eurobalise, vital relays, hot wheel detectors, highway crossing mechanisms.