Draft. Not Yet Approved. American Railway Engineering and Maintenance of Way Association Letter Ballot. 1. Committee and Subcommittee: 36

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1 American Railway Engineering and Maintenance of Way Association Letter allot 1. Committee and Subcommittee: Letter allot umber: : Assignment: 4. allot Item: MP : Recommended Vital Circuit Design Guidelines for Interconnection of Grade Crossing Warning Systems on Adjacent Tracks 5. Rationale:

2 Part Recommended Vital Circuit Design Guidelines for Interconnection of Grade Crossing Warning Systems on Adjacent Tracks Reaffirmed 2016Revised 2019 (6 Pages) A. Purpose 1. This Manual Part recommends vital circuit guidelines for interconnection circuits for adjacent tracks where it is required to have independent controls operate the grade crossing warning devices as a single system.. General 1. Control circuit interconnection between adjacent tracks may be required when an insufficient distance exists between same railroad or foreign railroad tracks to warrant independent warning devices. 2. Examples of adjacent track interconnection circuits are shown in Figure , Figure and Figure The warning devices will operate for train occupancy on either track. Some aspects of the circuit designs may vary depending on the design practices of the individual railroad. The interconnection shall be through the use of vital relays, vital inputs or outputs of solid state controllers, or vital communications protocol, such as the Spec. S Communications System Architecture, AAR Railway Electronics Manual, Section K-II, 2005 (formerly ATCS Spec. 200), or a combination thereof. 3. In addition to the standard crossing control interconnection items, consideration may be given to the following: a. -down indications for monitoring purposes. b. Advance preemption functions. c. -down indications for Advance Preemption. d. Second train logic. e. Local and/or remote indications for maintenance support. f. Control equipment health status. g. attery isolation for foreign railroad interconnection circuits, to prevent grounds. 1

3 Part Refer to Manual Part Recommended Functional/Operating Guidelines for Adjacent Track Interconnected Highway-Rail Grade Crossing Warning Systems. 5. Refer to Manual Part Recommended Instructions for Determining Warning Time and Calculating Minimum Approach Distance for Highway- Rail Grade Crossing Warning Systems. 6. Refer to Manual Part Recommended Vital Circuit Design Guidelines for Relay ased Flashing Light Applications for Highway-Rail Crossing Warning Devices or Manual Part Recommended Vital Circuit Design Guidelines for Flashing Light and Control Applications for Highway-Rail Grade Crossing Warning Devices. C. Operation 1. Application Solid State Controller Logic An example of an adjacent track interconnection, using a solid state crossing controller for each track, is shown in Figure When a train approaches the crossing on track, the relay for track is de-energized, which de-energizes the crossing control relay repeater (-) in the track A case. The de-energized - removes energy to the solid-state crossing controller input (I). The relay for track is de-energized when the gate for track is not vertical, which de-energizes the gate position relay repeater (-) in the track A case. The de-energized - removes energy to the solid state crossing controller gate position input (GATE UP). This will ensure that all lights continue to flash until both the A gate and the gate are vertical. The circuit operation is functionally identical for both tracks. Formatted: o underline, Hanging: 0.5", umbered + Level: 1 + umbering Style: 1, 2, 3, + Start at: 1 + Alignment: Left + Aligned at: 0.5" + Indent at: 0.75" 2

4 Part Commented [JS1]: Modify figure to show 86- to 86 degrees for clarification. A A RAILROAD A Figure : Example Adjacent Crossing Interconnection using Solid State Crossing Controller RAILROAD RAILROAD A CIRCUITS RAILROAD CIRCUITS - - A A - - SOLID-STATE CROSSIG COTROLLER GATE UP I A- A- TO A GATE COTROL OUT TO GATE COTROL OUT A- A- SOLID-STATE CROSSIG COTROLLER GATE UP I 3

5 Part Application Relay Logic An example of an adjacent track interconnection using relay logic is shown in Figure When a train approaches the crossing on track, the relay for track is de-energized, which de-energizes the crossing control relay repeater (-) in the track A case. The de-energized - removes energy to the XPR relay in the track A case. The relay for track is de-energized when the gate for track is not vertical, which de-energizes the gate position relay repeater (-) in the track A case. The de-energized - removes energy to the GPPR relay in the track A case. This will ensure that all lights continue to flash until both the A gate and the gate are vertical. The circuit operation is functionally identical for both tracks. Formatted: o underline, Hanging: 0.5", umbered + Level: 1 + umbering Style: 1, 2, 3, + Start at: 1 + Alignment: Left + Aligned at: 0.5" + Indent at: 0.75" 4

6 Part Commented [JS2]: Modify figure to show 86- to 86 degrees for clarification. A A RAILROAD A Figure : Example Adjacent Crossing Interconnection using Relay Logic RAILROAD RAILROAD A CIRCUITS RAILROAD CIRCUITS A A - - A- A- GPPR GPPR - A- XPR - - A- A- XPR 5

7 Part Adjacent Track Interconnection with Interior s An example of an adjacent track interconnection with interior gates is shown in Figure The interconnection circuits for this example are functionally identical to those shown in Figure or Figure Additional circuit elements are required within each case to support the operation of the interior gates. A (SIG 1) ITERIOR GATE (SIG 3) (SIG 4) Figure : Example Adjacent Crossing Interconnection with Interior s A ITERIOR GATE (SIG.2) RAILROAD A RAILROAD Formatted: o underline, Hanging: 0.5", umbered + Level: 1 + umbering Style: 1, 2, 3, + Start at: 1 + Alignment: Left + Aligned at: 0.5" + Indent at: 0.75" 6