diff --git a/docs/infrastructure/racks/rack01-elevation.svg b/docs/infrastructure/racks/rack01-elevation.svg
index 74a8a94..29b44b1 100644
--- a/docs/infrastructure/racks/rack01-elevation.svg
+++ b/docs/infrastructure/racks/rack01-elevation.svg
@@ -220,12 +220,12 @@
 <a href="/hardware/pdu01/">
 <title>pdu01 · pdu · in-use · cluster: — · 0U left</title>
 <rect x="12" y="40" width="16" height="960" fill="#e15759" stroke="#333333" stroke-width="1.5"/>
-<text x="20" y="520" text-anchor="middle" fill="#ffffff" transform="rotate(-90 20 520)">pdu01</text>
+<text x="20" y="520" text-anchor="middle" dominant-baseline="central" fill="#ffffff" transform="rotate(-90 20 520)">pdu01</text>
 </a>
 <a href="/hardware/pdu02/">
 <title>pdu02 · pdu · in-use · cluster: — · 0U right</title>
 <rect x="618" y="40" width="16" height="960" fill="#e15759" stroke="#333333" stroke-width="1.5"/>
-<text x="626" y="520" text-anchor="middle" fill="#ffffff" transform="rotate(-90 626 520)">pdu02</text>
+<text x="626" y="520" text-anchor="middle" dominant-baseline="central" fill="#ffffff" transform="rotate(-90 626 520)">pdu02</text>
 </a>
 <a href="/hardware/srv01/">
 <title>srv01 · server · staging · cluster: tappaas · shf01/front/slot 1</title>
diff --git a/docs/infrastructure/racks/rack01.md b/docs/infrastructure/racks/rack01.md
index 93a5b09..7885848 100644
--- a/docs/infrastructure/racks/rack01.md
+++ b/docs/infrastructure/racks/rack01.md
@@ -227,12 +227,12 @@ _Auto-generated from `docs/hardware/*.md` (items with `rack: rack01`) — do not
 <a href="/hardware/pdu01/">
 <title>pdu01 · pdu · in-use · cluster: — · 0U left</title>
 <rect x="12" y="40" width="16" height="960" fill="#e15759" stroke="#333333" stroke-width="1.5"/>
-<text x="20" y="520" text-anchor="middle" fill="#ffffff" transform="rotate(-90 20 520)">pdu01</text>
+<text x="20" y="520" text-anchor="middle" dominant-baseline="central" fill="#ffffff" transform="rotate(-90 20 520)">pdu01</text>
 </a>
 <a href="/hardware/pdu02/">
 <title>pdu02 · pdu · in-use · cluster: — · 0U right</title>
 <rect x="618" y="40" width="16" height="960" fill="#e15759" stroke="#333333" stroke-width="1.5"/>
-<text x="626" y="520" text-anchor="middle" fill="#ffffff" transform="rotate(-90 626 520)">pdu02</text>
+<text x="626" y="520" text-anchor="middle" dominant-baseline="central" fill="#ffffff" transform="rotate(-90 626 520)">pdu02</text>
 </a>
 <a href="/hardware/srv01/">
 <title>srv01 · server · staging · cluster: tappaas · shf01/front/slot 1</title>
diff --git a/scripts/gen_rack.py b/scripts/gen_rack.py
index 71d26b5..1efaa44 100644
--- a/scripts/gen_rack.py
+++ b/scripts/gen_rack.py
@@ -462,7 +462,8 @@ def render_svg(rack: str, items: list[dict]) -> str:
             f"fill=\"{color}\" {_stroke_attrs(fm.get('status'))}/>"
         )
         p.append(
-            f'<text x="{cx}" y="{cy}" text-anchor="middle" fill="#ffffff" '
+            f'<text x="{cx}" y="{cy}" text-anchor="middle" '
+            f'dominant-baseline="central" fill="#ffffff" '
             f'transform="rotate(-90 {cx} {cy})">{_esc(name)}</text>'
         )
         p.append("</a>")
diff --git a/tests/test_gen_rack.py b/tests/test_gen_rack.py
index 4842980..106fe9e 100644
--- a/tests/test_gen_rack.py
+++ b/tests/test_gen_rack.py
@@ -156,6 +156,14 @@ def test_render_svg_draws_zero_u_rail():
     assert "rotate(-90" in svg
 
 
+def test_render_svg_rail_label_is_centered_across_bar():
+    # The rotated 0U rail label must be centered across the narrow bar width,
+    # not sitting on the alphabetic baseline (which reads off-centre).
+    items = [item(hostname="pdu01", kind="pdu", rack_face="left")]
+    svg = gen_rack.render_svg("rack01", items)
+    assert 'dominant-baseline="central"' in svg
+
+
 def test_render_svg_both_face_draws_in_both_columns():
     items = [item(hostname="dev", rack_u=10, u_height=1, rack_face="both")]
     svg = gen_rack.render_svg("rack01", items)