TM 55-2200-001-12Change 4NATOUNCLASSIFIEDPART2:MAXIMUMSIZEENVELOPES:ENVELOPESAANDBA.ConceptandPracticalDeterminationofEnvelopesAandB8.Envelopes A and B are designed to facilitate the wartime planning and movement of flat wagons carrying militaryvehicles and equipment classified as "exceptional transport". The envelopes allow maximum flexibility of movement onEuropean railway systems, because the gauges are generally greater than the PPI gauges.B.GeneralCharacteristicsoftheseEnvelopes9.Bearing in mind the current amount of military equipment to be transported, the Group of Experts on theTransport of Out-of-Gauge Equipment considered two envelopes (Envelopes A and B).a.Both having a vertical axis of symmetry.b.Having the same contours in the upper portions (from 3.370 m above the rails).c.One outside, and the other within the PPI gauge width.10.The polygonal contours of the envelopes (in particular the portion above 3.370 m, which is identical for both)were determined taking into account everypossible route network and in such a way as to avoid any large-scaleoperating constraints. These envelopes will be found in the attached Annexes B (Envelope A) and C (Envelope B).Envelope B allows for a loading tolerance of ± 15 mm in width.C.EstablishmentofTrafficMapsforEnvelopesAandBonEuropeanRailSystems11.Envelopes A and B and their circulation conditions having been defined, each network will prepare circulationboards for each line section showing the operating constraints on its lines.By assembling these, each network will be able to prepare its own A and B envelope circulation maps.12.To obtain overall maps of A and B envelope circulation on the networks mentioned in Para.1, by simplyjuxtaposing the maps for each member country, it is essential that lines should be shown on the national maps on thebasis of the standard key described below:13.a.Singletracklines:= Clear way or minor movement constraints (e.g. local reductions in speed).••••••••••••••= Circulation possible with certain major constraints (e.g. no circulation or shunting on aneighbouring line).XXXXXXXX= Circulation impossible.- 3 -eaNATOUNCLASSIFIEDChange 4 CC-5
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