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Standard OSI Rev 12/2013 <br /> <br /> <br />EXHIBIT D <br />OPERATING SYSTEM INTERFACE (OSI) <br /> <br />PART 1 - GENERAL <br /> <br />1.01 DESCRIPTION <br />Outline for Contractor’s interface with Caltrain’s operating system, including track work, train <br />control, and communications. <br /> <br />1.02 DEFINITIONS <br /> <br />A. Caltrain: AKA, The Peninsula Corridor Joint Powers Board (PCJPB) is a public agency <br />comprised of three counties; San Francisco, San Mateo and Santa Clara, and is otherwise <br />known as Caltrain. <br />B. Railroad Contract Operator: Under contract with the PCJPB to operate and maintain the <br />Caltrain system. <br />C. Operating System: Includes, but is not limited to, the tracks on which trains and on-track <br />equipment operate or may potentially operate, and in addition any facilities closely <br />related to the operation of the railroad system including signal and communication masts, <br />bridges, poles, cables, signal houses, tunnels, culverts, grade crossings and station <br />platforms and facilities. <br />D. Operating Envelope: Anywhere within Caltrain property including any area that is an <br />essential component of the operating system. <br />E. Work Window: A designated period of time with a specific beginning and ending time for <br />which the track, signals, bridges and other Operating System elements within the <br />Operating Envelope are modified or temporarily removed from service to allow <br />construction or maintenance work to occur. Written authority from Caltrain, and an <br />approved Weekly Site-Specific Work Plan (SSWP), is required before a Contractor is <br />granted a Work Window. The Contractor’s Work Window shall have specific geographic <br />limits, which are defined in the approved SSWP. Modifications or suspension of train and <br />on-track equipment movements resulting from a Work Window involve written changes <br />to the Railroad’s Rules of Train and On-Track Equipment Operations. These written <br />changes are known as Track Bulletins and are categorized as follows. <br />(a) Multiple Track Window: An approved Work window in which passenger/ <br />commuter and freight train service on two or more adjacent main tracks is <br />suspended or halted. However, trains and on-track equipment associated with <br />construction and maintenance activities may still operate on the tracks with <br />suspended service but subject to the control of the Employee-in-Charge/ Flagman. <br />ATTY/AGR.2026.195/JPB License - Recycled Water at Beech (REV: 07-09-26 VR) (Page 21 of 29) <br />7.G. - Page 37 of 104 <br />135