{"abstract":"This document provides the public with notice that, on April 21, 2026, the Massachusetts Bay Transportation Authority (MBTA), as the host railroad, submitted a request to permit CSX Transportation, Inc. (CSX) to conduct field testing of the Interoperable Train Control positive train control (PTC) system on two segments of MBTA's North Side Fitchburg and Haverhill Lines utilizing CSX locomotives and equipment. FRA is publishing this notice and inviting public comment on MBTA's request to allow its tenant to test on its PTC system.","action":"Notice of availability and request for comments.","agencies":[{"raw_name":"DEPARTMENT OF TRANSPORTATION","name":"Transportation Department","id":492,"url":"https://www.federalregister.gov/agencies/transportation-department","json_url":"https://www.federalregister.gov/api/v1/agencies/492","parent_id":null,"slug":"transportation-department"},{"raw_name":"Federal Railroad Administration","name":"Federal Railroad Administration","id":185,"url":"https://www.federalregister.gov/agencies/federal-railroad-administration","json_url":"https://www.federalregister.gov/api/v1/agencies/185","parent_id":492,"slug":"federal-railroad-administration"}],"body_html_url":"https://www.federalregister.gov/documents/full_text/html/2026/05/05/2026-08738.html","cfr_references":[],"citation":"91 FR 24317","comment_url":"http://www.regulations.gov/commenton/FRA-2010-0030-0135","comments_close_on":"2026-06-04","correction_of":null,"corrections":[],"dates":"FRA will consider comments received by June 4, 2026. FRA may consider comments received after that date to the extent practicable and without delaying implementation of valuable or necessary modifications to a PTC system.","disposition_notes":null,"docket_ids":["Docket No. FRA-2010-0030"],"dockets":[{"supporting_documents":[],"agency_name":"FRA","documents":[{"comment_count":0,"comment_start_date":"2026-05-05","updated_at":"2026-05-05T14:56:48.438-04:00","comment_url":"https://www.regulations.gov/commenton/FRA-2010-0030-0135","allow_late_comments":false,"id":"FRA-2010-0030-0135","comment_end_date":"2026-06-05","regulations_dot_gov_open_for_comment":true}],"supporting_documents_count":0,"id":"FRA-2010-0030","title":"Massachusetts Bay Transportation Authority - Positive Train Control Plans"}],"document_number":"2026-08738","effective_on":null,"end_page":24317,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2026/05/05/2026-08738.xml","html_url":"https://www.federalregister.gov/documents/2026/05/05/2026-08738/massachusetts-bay-transportation-authoritys-request-for-approval-to-begin-field-testing-on-its","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2026-08738?publication_date=2026-05-05","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2026-05-05/2026-08738/mods.xml","not_received_for_publication":null,"page_length":1,"page_views":{"count":83,"last_updated":"2026-05-10 10:15:10 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2026-05-05/pdf/2026-08738.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2026-08738.pdf?1777898760","publication_date":"2026-05-05","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2026/05/05/2026-08738.txt","regulation_id_number_info":{},"regulation_id_numbers":[],"regulations_dot_gov_info":{"supporting_documents":[],"comments_count":0,"agency_id":"FRA","comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=FRA-2010-0030","supporting_documents_count":0,"docket_id":"FRA-2010-0030","document_id":"FRA-2010-0030-0135","regulation_id_number":null,"title":"Massachusetts Bay Transportation Authority - Positive Train Control Plans","checked_regulationsdotgov_at":"2026-05-06T11:55:08Z"},"regulations_dot_gov_url":"http://www.regulations.gov/commenton/FRA-2010-0030-0135","significant":null,"signing_date":null,"start_page":24317,"subtype":null,"title":"Massachusetts Bay Transportation Authority's Request for Approval To Begin Field Testing on Its Positive Train Control Network","toc_doc":"Massachusetts Bay Transportation Authority, Field Testing on Positive Train Control Network","toc_subject":"Request for Approval","topics":[],"type":"Notice","volume":91}