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A Review of the Department of Transportation's Plan for Analyzing and Testing Electronically Controlled Pneumatic Brakes Letter Report (Phase 2) (2017) / Chapter Skim
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Pages 43-52

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From page 43...
...   35 FIGURE H-2. According to DOT, there is a notable benefit to ECP brakes, especially in the initial several seconds (critical time)
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From page 44...
... 36 Appendix I Additional Validation of FRA Puncture Estimation Methodology from DOT24 Confidence in the DOT Methodology At a recent meeting, the NAS had requested additional metrics that might ensure confidence in the DOT methodology. Elements that address this issue include:  Confidence in the input parameters  Confirmation that the trends of model prediction are in line with expectations  Validation against physical derailment data  Validation against other studies These elements are discussed further in this presentation.
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From page 45...
...  T tu This revie are in line 1This chart Give us confide These inc  B w  T sh  T w 1This effec he impact for res in real lif w offers con with expecta is based on pr n that the de nce in the sim lude: oth the sprea ith real life o he distance t ows good co he number of ith increasing tively also con ce magnitud e, based on th fidence that tions. eviously publi Addi railment spe ulation resu d and the av bservations raveled by th mparison cars deraile lateral rail s firms that the es are in line e various im the trends an Derailmen shed work.
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From page 46...
... The ment incid Qua tors from or a sill ty Rail tures and Wor (ATCCRP  T pa These elem As s done by D  E fu impactor dis ent (see next litatively, thi several derai pe impact. induced pun the smaller fr k done by D )
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From page 47...
... Thes The analy Ther These car The three  T  T  T As presen parameter In ad responds The formance. e research e tical methods efore, the DO strength capa main inputs i he derailmen he impactor s he car strengt ted in the pr s.
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From page 48...
... 40 Trends – Derailed Cars The average number of cars derailed increases with increasing derailment speed. The spread of the number of cars derailed (over each set of 18 simulations)
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From page 49...
... Model esti A review  T  T  C Aliceville  90  2  38  le  26  R Following of a 100-c mates (assumin of the data pr he spread of p he average is oncerns that , AL derailm cars, loaded head end loc mph, derail vel grade, tra cars deraile ear loco trave slides comp ar DP train a Punctures f g DOT-111 ta Pu esented in th unctures is i in line with r the ‘averagin Comparison ent oil train os, 1 DP loco ment initiated ck on raised d, 25 total pu lled 1,240 fe are this to the t 40 mph. Comparison rom FRA Si nk design)
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From page 50...
... Num dicted by (as shown Number o http://ar ber of cars d model is som on next slide f punctures in NO ticles.chicag Final pil erailed and ewhat below ) , perhaps be Comparison Aliceville in TE: An imag otribune.com e-up configu distance trav Aliceville n cause the car of FRA Sim cident is on Pile-up Ima e of the derai /2013-11-08/ tank-train ration for sim 42 elled by rear umber, but A s fell from a ulation to a the high side ge – Alicevi lment at Alic news/sns-rt-u -derails-shal ulated DP loco match liceville inci raised emban Particular I of the scatter lle, AL eville, AL is a s-crude-train e-oil derailment, perfectly.
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From page 51...
... Whi that the m in the actu  P  N  N  T m Prediction  C [T R  D (2 D CPR AAR formance  R  T w While the the fact th AAR valu 1Across all 2Calculated le it is difficu odel faithful al derailmen ile-up configu umber of der umber of pun he distance t odeling meth Val s from the D onditional Pr he DOT wo SI-AAR on t erailment mo 007 ASME . Jeong, et.
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From page 52...
... DOT results fro  Pu  M These two of Motion Results ar separation  T The  C  C  V  V As demon come from puts from estimates fo m two derail rpose-built m odel develop Volpe mode for Train De e similar and , whereas the his would exp DOT has sev onfidence in onfirmation t alidation aga alidation aga strated throu just one po the model. DOT M r number of ment models odel ed using the ls produced s railment Dyn DOT M trends are th DOT model lain the min eral elements the input para hat the trends inst physical inst other stu ghout this pr int of validat ethodology cars deraile developed at commercial r imilar result amics", D
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