station-master/docs/design/board-layout-studies.html

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</style><h1>Station Master — board layout studies</h1><p class="q">Four ways to draw the same position, so that where a train is, which track it is on, and whether two cards actually join can be read at a glance rather than from a sentence. Nothing here is wired to the engine — these are drawings.</p><section><h2>First: what the rules actually limit</h2><table><tr><th>Where</th><th>Trains allowed</th><th>What happens if exceeded</th></tr><tr><td>Division Point (either end)</td><td><b>No limit</b></td><td>trains simply queue</td></tr><tr><td>Mainline card (most)</td><td><b>1</b></td><td>a follower needs the Superintendent&rsquo;s clearance (&sect;8.1)</td></tr><tr><td>Double Track / Uncontrolled Siding</td><td><b>2+</b> &mdash; &ldquo;trains may pass&rdquo;</td><td>no ruling needed at all</td></tr><tr><td>Whistle Post</td><td><b>1</b> A/D track</td><td>next arrival is an automatic collision</td></tr><tr><td>Depot / Station / Terminal</td><td><b>2 / 3 / 4</b></td><td>same &mdash; collision, &minus;5</td></tr></table><p>So capacity is real and worth drawing: it is 1 almost everywhere on the Mainline, 2+ on exactly two card types, fixed by tier at an Office, and unbounded at the Division Points. That maps cleanly onto <i>count the slots</i>.</p><div class="key"><span><span class="sw" style="background:#1b2534;border:2px solid #4d6fa8"></span>Office — fixed A/D tracks</span><span><span class="sw" style="background:#151f19;border:2px dashed #3f7a52"></span>Division Point — unlimited</span><span><span class="sw" style="background:#191c22;border:1px solid #39424e"></span>Mainline card</span><span><span class="sw" style="background:#241d1d;border:1px solid #8a5a5a"></span>Limits</span><span><span class="sw" style="background:#201c26;border:1px solid #7a5f9a"></span>Industry</span></div></section><section><h2><span class="n">A.</span> Faithful cards — the tabletop, redrawn</h2><p>The through rail sits at the same height on every card, so cards butt together and the line runs unbroken &mdash; which is exactly how the printed cards work. Every place a marker may stand is a printed square, so capacity is something you count rather than read.</p><svg viewBox="0 0 940 250" class="mk"><text class="hd" x="0" y="14">THE DIVISION — west to east</text><g transform="translate(0,26)"><rect class="card dp" x="0" y="0" width="132" height="96" rx="4"/><text class="cn" x="6" y="13">West DP</text><text class="cs" x="6" y="90">unlimited</text><line class="rail" x1="0" y1="23.5" x2="132" y2="23.5"/><line class="rail" x1="0" y1="28.5" x2="132" y2="28.5"/><line class="tie" x1="0.0" y1="21.5" x2="0.0" y2="30.5"/><line class="tie" x1="7.333333333333333" y1="21.5" x2="7.333333333333333" y2="30.5"/><line class="tie" x1="14.666666666666666" y1="21.5" x2="14.666666666666666" y2="30.5"/><line class="tie" x1="22.0" y1="21.5" x2="22.0" y2="30.5"/><line class="tie" x1="29.333333333333332" y1="21.5" x2="29.333333333333332" y2="30.5"/><line class="tie" x1="36.666666666666664" y1="21.5" x2="36.666666666666664" y2="30.5"/><line class="tie" x1="44.0" 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x2="110.0" y2="30.5"/><line class="tie" x1="117.33333333333333" y1="21.5" x2="117.33333333333333" y2="30.5"/><line class="tie" x1="124.66666666666667" y1="21.5" x2="124.66666666666667" y2="30.5"/><line class="tie" x1="132.0" y1="21.5" x2="132.0" y2="30.5"/><rect class="slot " x="10" y="66" width="34" height="20" rx="2"/><rect class="slot " x="50" y="66" width="34" height="20" rx="2"/><rect class="slot " x="90" y="66" width="34" height="20" rx="2"/><text class="cs" x="124" y="60" text-anchor="end">∞</text></g><g class="train"><rect x="27" y="93" width="26" height="18" rx="3"/><text class="tlab" x="40" y="106" text-anchor="middle">T3</text></g><g class="train"><rect x="163" y="43" width="26" height="18" rx="3"/><text class="tlab" x="176" y="56" text-anchor="middle">T7</text></g><rect class="car" x="193" y="46" width="11" height="12" rx="1.5"/><rect class="car" x="206" y="46" width="11" height="12" rx="1.5"/><g class="train"><rect x="287" y="93" width="26" height="18" rx="3"/><text class="tlab" x="300" y="106" text-anchor="middle">T12</text></g><rect class="car" x="317" y="96" width="11" height="12" rx="1.5"/><rect class="car" x="330" y="96" width="11" height="12" rx="1.5"/><rect class="car" x="343" y="96" width="11" height="12" rx="1.5"/><g class="train"><rect x="435" y="43" width="26" height="18" rx="3"/><text class="tlab" x="448" y="56" text-anchor="middle">T4</text></g><g class="train"><rect x="435" y="65" width="26" height="18" rx="3"/><text class="tlab" x="448" y="78" text-anchor="middle">T5</text></g><text class="note" x="0" y="240">Rail meets rail across every join. A square = one place a train may stand; ∞ = no limit.</text></svg><p class="q"><b>Strength:</b> closest to the physical game; a player who has seen the cards needs no explanation. <b>Cost:</b> wide. Five cards already fill the strip, and a real Division has more.</p></section><section><h2><span class="n">B.</span> Dispatcher&rsquo;s diagram — count the lines</h2><p>How a real dispatcher sees a division: one continuous line per running track, section boundaries as thin seams. Capacity is the number of parallel lines, and a train sits <i>on</i> a line.</p><svg viewBox="0 0 940 250" class="mk"><text class="hd" x="0" y="14">THE DIVISION — dispatcher's track diagram</text><line class="seam" x1="0" y1="34" x2="0" y2="150"/><text class="cn" x="8" y="30">West DP</text><line class="rail" x1="8" y1="57.5" x2="182" y2="57.5"/><line class="rail" x1="8" y1="62.5" x2="182" y2="62.5"/><line class="tie" x1="8.0" y1="55.5" x2="8.0" y2="64.5"/><line class="tie" x1="15.25" y1="55.5" x2="15.25" y2="64.5"/><line class="tie" x1="22.5" y1="55.5" x2="22.5" y2="64.5"/><line class="tie" x1="29.75" y1="55.5" x2="29.75" y2="64.5"/><line class="tie" x1="37.0" y1="55.5" x2="37.0" y2="64.5"/><line class="tie" x1="44.25" y1="55.5" x2="44.25" y2="64.5"/><line class="tie" x1="51.5" y1="55.5" x2="51.5" y2="64.5"/><line class="tie" x1="58.75" y1="55.5" x2="58.75" y2="64.5"/><line class="tie" x1="66.0" y1="55.5" x2="66.0" y2="64.5"/><line class="tie" x1="73.25" y1="55.5" x2="73.25" 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y2="124.5"/><line class="tie" x1="44.25" y1="115.5" x2="44.25" y2="124.5"/><line class="tie" x1="51.5" y1="115.5" x2="51.5" y2="124.5"/><line class="tie" x1="58.75" y1="115.5" x2="58.75" y2="124.5"/><line class="tie" x1="66.0" y1="115.5" x2="66.0" y2="124.5"/><line class="tie" x1="73.25" y1="115.5" x2="73.25" y2="124.5"/><line class="tie" x1="80.5" y1="115.5" x2="80.5" y2="124.5"/><line class="tie" x1="87.75" y1="115.5" x2="87.75" y2="124.5"/><line class="tie" x1="95.0" y1="115.5" x2="95.0" y2="124.5"/><line class="tie" x1="102.25" y1="115.5" x2="102.25" y2="124.5"/><line class="tie" x1="109.5" y1="115.5" x2="109.5" y2="124.5"/><line class="tie" x1="116.75" y1="115.5" x2="116.75" y2="124.5"/><line class="tie" x1="124.0" y1="115.5" x2="124.0" y2="124.5"/><line class="tie" x1="131.25" y1="115.5" x2="131.25" y2="124.5"/><line class="tie" x1="138.5" y1="115.5" x2="138.5" y2="124.5"/><line class="tie" x1="145.75" y1="115.5" x2="145.75" y2="124.5"/><line class="tie" x1="153.0" y1="115.5" x2="153.0" y2="124.5"/><line class="tie" x1="160.25" y1="115.5" x2="160.25" y2="124.5"/><line class="tie" x1="167.5" y1="115.5" x2="167.5" y2="124.5"/><line class="tie" x1="174.75" y1="115.5" x2="174.75" y2="124.5"/><line class="tie" x1="182.0" y1="115.5" x2="182.0" y2="124.5"/><text class="cs" x="8" y="152">no limit — trains queue here</text><line class="seam" x1="190" y1="34" x2="190" y2="150"/><text class="cn" x="198" y="30">Heavy Grade</text><line class="rail" x1="198" y1="57.5" x2="362" y2="57.5"/><line class="rail" x1="198" y1="62.5" x2="362" y2="62.5"/><line class="tie" x1="198.0" y1="55.5" x2="198.0" y2="64.5"/><line class="tie" x1="205.1304347826087" y1="55.5" x2="205.1304347826087" y2="64.5"/><line class="tie" x1="212.26086956521738" y1="55.5" x2="212.26086956521738" y2="64.5"/><line class="tie" x1="219.3913043478261" y1="55.5" x2="219.3913043478261" y2="64.5"/><line class="tie" x1="226.52173913043478" y1="55.5" x2="226.52173913043478" y2="64.5"/><line class="tie" 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A train sits ON a line, so "which track" is never ambiguous.</text><text class="note" x="0" y="205">Loses the card-by-card feel, but nothing about connection or occupancy can be misread.</text></svg><p class="q"><b>Strength:</b> nothing about occupancy or capacity can be misread, and it stays compact at any Division length. <b>Cost:</b> abandons the card metaphor entirely &mdash; terrain becomes a label rather than a picture.</p></section><section><h2><span class="n">C.</span> Swimlanes — one lane per track</h2><p>The Running Track is the top lane and never moves. Each further track &mdash; A/D tracks, industry sidings &mdash; is its own lane beneath. 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x="6" y="90">siding full — nothing more can be spotted</text></g><g class="train"><rect x="299" y="82" width="26" height="18" rx="3"/><text class="tlab" x="312" y="95" text-anchor="middle">T12</text></g><rect class="car" x="329" y="85" width="11" height="12" rx="1.5"/><rect class="car" x="342" y="85" width="11" height="12" rx="1.5"/><g class="train"><rect x="185" y="43" width="26" height="18" rx="3"/><text class="tlab" x="198" y="56" text-anchor="middle">T7</text></g><text class="note" x="0" y="300">Nearest to what exists now: same grid, but a join is visible as rail meeting rail.</text><text class="note" x="0" y="320">A curve leaving the Running Track is drawn, so a turnout that goes nowhere is obvious at a glance.</text></svg><p class="q"><b>Strength:</b> preserves the map-like district, and a turnout whose leg goes nowhere becomes obvious. <b>Cost:</b> does least for the Mainline strip, which is where capacity confusion actually bites.</p></section><section><h2>What I would do</h2><div class="verdict"><p><b>D for your Office Area, B for the Division strip.</b></p><p>They fail in opposite places. The district is a map you build, and it wants to stay a map &mdash; so draw the rails on the grid you already have (D). The Division is not a map; it is a queue of sections with hard capacities, which is precisely what a dispatcher&rsquo;s diagram is for (B), and it stays readable however long the Division grows.</p><p>A is the most faithful and the most charming, and I would keep it in reserve: it is the right answer if this ever becomes a table you look down on rather than a panel you read. C solves the one question the others answer least well &mdash; which of several A/D tracks a train occupies &mdash; so if that turns out to be the confusion that matters most, C for the Office alone is worth revisiting.</p><p>Every drawing above shares one idea worth keeping whichever you pick: <b>a square is a place a train may stand, and an empty square is spare capacity.</b> That single convention makes &ldquo;how many more trains fit here&rdquo; answerable without a legend.</p></div></section>