Source: https://www.law.cornell.edu/cfr/text/49/appendix-F_to_part_238
Timestamp: 2017-05-22 19:46:01
Document Index: 783038586

Matched Legal Cases: ['art 238', 'art 238', 'art_238', 'art 238', '§ 238', '§ 238']

49 CFR Appendix F to Part 238, Alternative Dynamic Performance Requirements for Front End Structures of Cab Cars and MU Locomotives | US Law | LII / Legal Information Institute
CFR › Title 49 › Subtitle B › Chapter II › Part 238 › Subpart G › Appendix F_to_part_238 49 CFR Appendix F to Part 238, Alternative Dynamic Performance Requirements for Front End Structures of Cab Cars and MU Locomotives
(1) In lieu of meeting the requirements of § 238.211, the front end frame acting together with its supporting car body structure shall be capable of absorbing a minimum of 135,000 foot-pounds of energy (0.18 megajoule) prior to or during structural deformation by withstanding a frontal impact with a rigid object in accordance with all of the requirements set forth in paragraphs (a)(2) through (a)(4) of this appendix:
(i) The striking surface of the object shall be centered at a height of 30 inches above the top of the underframe;
(4) The nominal weights of the object and the cab car or MU locomotive, as ballasted, and the speed of the object may be adjusted to impart the minimum of 135,000 foot-pounds of energy (0.18 megajoule) to be absorbed (Ea), in accordance with the following formula: Ea = E0−Ef
E0 = Energy of initially moving object at impact = 1/2 m1*V02.
Ef = Energy after impact = 1/2 (m1 m2)*Vf2.
(1) In lieu of meeting the requirements of § 238.213, the front end frame acting together with its supporting car body structure shall be capable of absorbing a minimum of 120,000 foot-pounds of energy (0.16 megajoule) prior to or during structural deformation by withstanding a frontal impact with a rigid object in accordance with all of the requirements set forth in paragraphs (b)(2) through (b)(4) of this appendix:
(i) Except as provided in paragraph (b)(3)(ii) of this appendix, as a result of the impact, there shall be no more than 10 inches of longitudinal, permanent deformation into the occupied volume. There shall also be no complete separation of the post, its connection to the underframe, its connection to either the roof structure or the anti-telescoping plate (if used), or of its supporting car body structure. (A graphical description of the frontal impact is provided in Figure 2 to this appendix.); and
(ii) After FRA review and approval of a plan, including acceptance criteria, to evaluate compliance with this paragraph (b), cab cars and MU locomotives utilizing low-level passenger boarding on the non-operating side of the cab may have two, full-height corner posts on that side, one post located ahead of the stepwell and one located behind it, so that the corner post located ahead of the stepwell is permitted to fail provided that - (A) The corner post located behind the stepwell shall have no more than 10 inches of longitudinal, permanent deformation; and
(4) The nominal weights of the object and the cab car or MU locomotive, as ballasted, and the speed of the object may be adjusted to impart the minimum of 120,000 foot-pounds of energy (0.16 megajoule) to be absorbed (Ea), in accordance with the following formula: Ea = E0−Ef
[ 75 FR 1230, Jan. 8, 2010]