diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..1c8ae78
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+# local backups
+*.bak
+*.backup
+*.bkp
\ No newline at end of file
diff --git a/echoes_of_transit.drawio b/echoes_of_transit.drawio
index ce14a57..62da1d8 100644
--- a/echoes_of_transit.drawio
+++ b/echoes_of_transit.drawio
@@ -1,6 +1,6 @@
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         <mxCell id="1" parent="0" />
@@ -116,6 +116,292 @@
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           </mxGeometry>
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+        <mxCell id="xl_MaoASnQQX8_LYVu4i-1" parent="1" style="swimlane;whiteSpace=wrap;html=1;" value="normal-vehicle model" vertex="1">
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+        </mxCell>
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+        <mxCell id="xmRfNV80X8qhNIKoXtJH-2" parent="xl_MaoASnQQX8_LYVu4i-1" style="text;html=1;whiteSpace=wrap;strokeColor=none;fillColor=none;align=center;verticalAlign=middle;rounded=0;autosize=1;resizable=0;" value="willing：等待意愿" vertex="1">
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+        </mxCell>
+        <mxCell id="xmRfNV80X8qhNIKoXtJH-3" parent="xl_MaoASnQQX8_LYVu4i-1" style="text;html=1;whiteSpace=wrap;strokeColor=none;fillColor=none;align=center;verticalAlign=middle;rounded=0;autosize=1;resizable=0;" value="transfer：换乘站" vertex="1">
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+        <mxCell id="xmRfNV80X8qhNIKoXtJH-33" parent="xmRfNV80X8qhNIKoXtJH-31" style="text;strokeColor=none;fillColor=none;align=left;verticalAlign=middle;spacingLeft=4;spacingRight=4;overflow=hidden;points=[[0,0.5],[1,0.5]];portConstraint=eastwest;rotatable=0;whiteSpace=wrap;html=1;" value="seating_capacity：核载人数" vertex="1">
+          <mxGeometry height="30" width="140" y="60" as="geometry" />
+        </mxCell>
+        <mxCell id="xmRfNV80X8qhNIKoXtJH-30" parent="xl_MaoASnQQX8_LYVu4i-1" style="text;html=1;whiteSpace=wrap;strokeColor=none;fillColor=none;align=center;verticalAlign=middle;rounded=0;autosize=1;resizable=0;" value="passengers：乘客" vertex="1">
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+        <mxCell id="xmRfNV80X8qhNIKoXtJH-36" parent="1" style="swimlane;whiteSpace=wrap;html=1;" value="outside-vehicle model" vertex="1">
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