iiasa · khaeru · Apr 18, 2026 · Apr 18, 2026 · Apr 18, 2026 · Apr 18, 2026
diff --git a/doc/transport/input.rst b/doc/transport/input.rst
@@ -136,6 +136,7 @@ Quick links to each of the data flows:
 :data:`~.data.input_cap_new`
 :data:`~.data.input_ref_ldv`
 :data:`~.data.input_share`
+:class:`~.data.InputVehicle`
 :class:`~.data.Lifetime`
 :data:`~.data.load_factor_f`
 :data:`~.data.load_factor_p`
@@ -233,6 +234,16 @@ Quick links to each of the data flows:
 .. autodata:: message_ix_models.model.transport.data.input_cap_new
 .. autodata:: message_ix_models.model.transport.data.input_ref_ldv
 .. autodata:: message_ix_models.model.transport.data.input_share
+.. autoclass:: message_ix_models.model.transport.data.InputVehicle
+
+   References:
+
+   - `message_data#608 <https://github.com/iiasa/message_data/issues/608>`_.
+   - https://www.bts.gov/content/energy-intensity-class-i-railroad-freight-service-1
+   - https://www.bts.gov/content/class-i-rail-freight-fuel-consumption-and-travel-0
+   - Aredah et al. (2024). `doi: 10.1016/j.apenergy.2023.122411
+     <https://doi.org/10.1016/j.apenergy.2023.122411>`_
+
 .. autoclass:: message_ix_models.model.transport.data.Lifetime
 .. autodata:: message_ix_models.model.transport.data.load_factor_f
 .. autodata:: message_ix_models.model.transport.data.load_factor_p

diff --git a/doc/whatsnew.rst b/doc/whatsnew.rst
@@ -20,6 +20,9 @@ Next release
 - Adjust :mod:`.project.ssp.transport` (:pull:`485`):
 - Add stub of :func:`.scenariomip.workflow.generate` (:pull:`394`).
 - New guide on HOWTO :doc:`/howto/report` (:pull:`488`).
+- Improve :doc:`/transport/index` (:pull:`497`):
+
+  .. todo:: Expand.
 
 v2026.4.17
 ==========

diff --git a/message_ix_models/data/boku/glomis-material/CircEUlar-A 2e17.csv b/message_ix_models/data/boku/glomis-material/CircEUlar-A 2e17.csv
diff --git a/message_ix_models/data/boku/glomis-material/CircEUlar-S 2e17.csv b/message_ix_models/data/boku/glomis-material/CircEUlar-S 2e17.csv
diff --git a/message_ix_models/data/boku/glomis-material/CircEUlar-S.csv b/message_ix_models/data/boku/glomis-material/CircEUlar-S.csv
diff --git a/message_ix_models/data/boku/glomis-material/CircEular-A.csv b/message_ix_models/data/boku/glomis-material/CircEular-A.csv
diff --git a/message_ix_models/data/boku/glomis-material/Circular-N 2e17.csv b/message_ix_models/data/boku/glomis-material/Circular-N 2e17.csv
diff --git a/message_ix_models/data/boku/glomis-material/Circular-N.csv b/message_ix_models/data/boku/glomis-material/Circular-N.csv
diff --git a/message_ix_models/data/boku/glomis-material/LED-SSP2.csv b/message_ix_models/data/boku/glomis-material/LED-SSP2.csv
diff --git a/message_ix_models/data/boku/glomis-material/SSP2-R 2e17.csv b/message_ix_models/data/boku/glomis-material/SSP2-R 2e17.csv
diff --git a/message_ix_models/data/boku/glomis-material/SSP2-R.csv b/message_ix_models/data/boku/glomis-material/SSP2-R.csv
diff --git a/message_ix_models/data/boku/glomis-stock/CircEUlar-A 2e17.csv b/message_ix_models/data/boku/glomis-stock/CircEUlar-A 2e17.csv
diff --git a/message_ix_models/data/boku/glomis-stock/CircEUlar-S 2e17.csv b/message_ix_models/data/boku/glomis-stock/CircEUlar-S 2e17.csv
diff --git a/message_ix_models/data/boku/glomis-stock/CircEUlar-S.csv b/message_ix_models/data/boku/glomis-stock/CircEUlar-S.csv
diff --git a/message_ix_models/data/boku/glomis-stock/CircEular-A.csv b/message_ix_models/data/boku/glomis-stock/CircEular-A.csv
diff --git a/message_ix_models/data/boku/glomis-stock/Circular-N 2e17.csv b/message_ix_models/data/boku/glomis-stock/Circular-N 2e17.csv
diff --git a/message_ix_models/data/boku/glomis-stock/Circular-N.csv b/message_ix_models/data/boku/glomis-stock/Circular-N.csv
diff --git a/message_ix_models/data/boku/glomis-stock/LED-SSP2.csv b/message_ix_models/data/boku/glomis-stock/LED-SSP2.csv
diff --git a/message_ix_models/data/boku/glomis-stock/SSP2-R 2e17.csv b/message_ix_models/data/boku/glomis-stock/SSP2-R 2e17.csv
diff --git a/message_ix_models/data/boku/glomis-stock/SSP2-R.csv b/message_ix_models/data/boku/glomis-stock/SSP2-R.csv
diff --git a/message_ix_models/data/report/global.yaml b/message_ix_models/data/report/global.yaml
@@ -747,12 +747,6 @@ general:
   args:
     units: 'GWa / year'
 
-- key: gdp_ppp
-  comp: product
-  inputs:
-  - GDP
-  - MERtoPPP
-
 # CH4 emissions from GLOBIOM: select only the subset
 - key: land_out:n-s-y-c-l-h:CH4_0
   comp: select

diff --git a/message_ix_models/data/sdmx/IIASA_ECE_CL_SCENARIO_DIGSY(0.2.0).xml b/message_ix_models/data/sdmx/IIASA_ECE_CL_SCENARIO_DIGSY(0.2.0).xml
@@ -0,0 +1,22 @@
+<?xml version='1.0' encoding='utf-8'?>
+<mes:Structure xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:com="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/common" xmlns:data="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/data/structurespecific" xmlns:footer="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/message/footer" xmlns:gen="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/data/generic" xmlns:md_ss="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/metadata/structurespecific" xmlns:md="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/metadata/generic" xmlns:mes="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/message" xmlns:reg="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/registry" xmlns:str="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/structure">
+  <mes:Header>
+    <mes:ID>none</mes:ID>
+    <mes:Test>false</mes:Test>
+    <mes:Prepared>2026-06-16T15:15:24.904611</mes:Prepared>
+    <mes:Sender id="none"/>
+    <mes:Source xml:lang="en">Generated by message_ix_models 2026.4.18.dev116+g63d32e6eb.d20260603</mes:Source>
+  </mes:Header>
+  <mes:Structures>
+    <str:Codelists>
+      <str:Codelist isExternalReference="false" isFinal="true" agencyID="IIASA_ECE" version="0.2.0" id="CL_SCENARIO_DIGSY" urn="urn:sdmx:org.sdmx.infomodel.codelist.Codelist=IIASA_ECE:CL_SCENARIO_DIGSY(0.2.0)">
+        <str:Code id="BASE" urn="urn:sdmx:org.sdmx.infomodel.codelist.Code=IIASA_ECE:CL_SCENARIO_DIGSY(0.2.0).BASE"/>
+        <str:Code id="BEST-C" urn="urn:sdmx:org.sdmx.infomodel.codelist.Code=IIASA_ECE:CL_SCENARIO_DIGSY(0.2.0).BEST-C"/>
+        <str:Code id="BEST-S" urn="urn:sdmx:org.sdmx.infomodel.codelist.Code=IIASA_ECE:CL_SCENARIO_DIGSY(0.2.0).BEST-S"/>
+        <str:Code id="WORST-C" urn="urn:sdmx:org.sdmx.infomodel.codelist.Code=IIASA_ECE:CL_SCENARIO_DIGSY(0.2.0).WORST-C"/>
+        <str:Code id="WORST-S" urn="urn:sdmx:org.sdmx.infomodel.codelist.Code=IIASA_ECE:CL_SCENARIO_DIGSY(0.2.0).WORST-S"/>
+        <str:Code id="_Z" urn="urn:sdmx:org.sdmx.infomodel.codelist.Code=IIASA_ECE:CL_SCENARIO_DIGSY(0.2.0)._Z"/>
+      </str:Codelist>
+    </str:Codelists>
+  </mes:Structures>
+</mes:Structure>
diff --git a/message_ix_models/data/sdmx/IIASA_ECE_CL_SCENARIO_EDITS_MCE(0.2.0).xml b/message_ix_models/data/sdmx/IIASA_ECE_CL_SCENARIO_EDITS_MCE(0.2.0).xml
@@ -0,0 +1,19 @@
+<?xml version='1.0' encoding='utf-8'?>
+<mes:Structure xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:com="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/common" xmlns:data="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/data/structurespecific" xmlns:footer="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/message/footer" xmlns:gen="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/data/generic" xmlns:md_ss="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/metadata/structurespecific" xmlns:md="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/metadata/generic" xmlns:mes="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/message" xmlns:reg="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/registry" xmlns:str="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/structure">
+  <mes:Header>
+    <mes:ID>none</mes:ID>
+    <mes:Test>false</mes:Test>
+    <mes:Prepared>2026-06-16T15:27:26.647846</mes:Prepared>
+    <mes:Sender id="none"/>
+    <mes:Source xml:lang="en">Generated by message_ix_models 2026.4.18.dev116+g63d32e6eb.d20260603</mes:Source>
+  </mes:Header>
+  <mes:Structures>
+    <str:Codelists>
+      <str:Codelist isExternalReference="false" isFinal="true" agencyID="IIASA_ECE" version="0.2.0" id="CL_SCENARIO_EDITS_MCE" urn="urn:sdmx:org.sdmx.infomodel.codelist.Codelist=IIASA_ECE:CL_SCENARIO_EDITS_MCE(0.2.0)">
+        <str:Code id="CA" urn="urn:sdmx:org.sdmx.infomodel.codelist.Code=IIASA_ECE:CL_SCENARIO_EDITS_MCE(0.2.0).CA"/>
+        <str:Code id="HA" urn="urn:sdmx:org.sdmx.infomodel.codelist.Code=IIASA_ECE:CL_SCENARIO_EDITS_MCE(0.2.0).HA"/>
+        <str:Code id="_Z" urn="urn:sdmx:org.sdmx.infomodel.codelist.Code=IIASA_ECE:CL_SCENARIO_EDITS_MCE(0.2.0)._Z"/>
+      </str:Codelist>
+    </str:Codelists>
+  </mes:Structures>
+</mes:Structure>
diff --git a/message_ix_models/data/sdmx/IIASA_ECE_CL_SCENARIO_FUTURES(1.0).xml b/message_ix_models/data/sdmx/IIASA_ECE_CL_SCENARIO_FUTURES(1.0).xml
@@ -0,0 +1,34 @@
+<?xml version='1.0' encoding='utf-8'?>
+<mes:Structure xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:com="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/common" xmlns:data="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/data/structurespecific" xmlns:footer="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/message/footer" xmlns:gen="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/data/generic" xmlns:md_ss="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/metadata/structurespecific" xmlns:md="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/metadata/generic" xmlns:mes="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/message" xmlns:reg="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/registry" xmlns:str="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/structure">
+  <mes:Header>
+    <mes:ID>none</mes:ID>
+    <mes:Test>false</mes:Test>
+    <mes:Prepared>2026-06-16T17:16:54.307803</mes:Prepared>
+    <mes:Sender id="none"/>
+    <mes:Source xml:lang="en">Generated by message_ix_models 2026.4.18.dev116+g63d32e6eb.d20260603</mes:Source>
+  </mes:Header>
+  <mes:Structures>
+    <str:Codelists>
+      <str:Codelist isExternalReference="false" isFinal="true" agencyID="IIASA_ECE" version="1.0" id="CL_SCENARIO_FUTURES" urn="urn:sdmx:org.sdmx.infomodel.codelist.Codelist=IIASA_ECE:CL_SCENARIO_FUTURES(1.0)">
+        <str:Code id="BASE" urn="urn:sdmx:org.sdmx.infomodel.codelist.Code=IIASA_ECE:CL_SCENARIO_FUTURES(1.0).BASE">
+          <com:Name xml:lang="en">Base scenario</com:Name>
+        </str:Code>
+        <str:Code id="A___" urn="urn:sdmx:org.sdmx.infomodel.codelist.Code=IIASA_ECE:CL_SCENARIO_FUTURES(1.0).A___">
+          <com:Name xml:lang="en">Activity</com:Name>
+        </str:Code>
+        <str:Code id="AS__" urn="urn:sdmx:org.sdmx.infomodel.codelist.Code=IIASA_ECE:CL_SCENARIO_FUTURES(1.0).AS__">
+          <com:Name xml:lang="en">Activity, structure</com:Name>
+        </str:Code>
+        <str:Code id="ASI_" urn="urn:sdmx:org.sdmx.infomodel.codelist.Code=IIASA_ECE:CL_SCENARIO_FUTURES(1.0).ASI_">
+          <com:Name xml:lang="en">Activity, structure, intensity</com:Name>
+        </str:Code>
+        <str:Code id="ASIF" urn="urn:sdmx:org.sdmx.infomodel.codelist.Code=IIASA_ECE:CL_SCENARIO_FUTURES(1.0).ASIF">
+          <com:Name xml:lang="en">Activity, structure, intensity, fuels</com:Name>
+        </str:Code>
+        <str:Code id="DEBUG" urn="urn:sdmx:org.sdmx.infomodel.codelist.Code=IIASA_ECE:CL_SCENARIO_FUTURES(1.0).DEBUG">
+          <com:Name xml:lang="en">Additional scenario for debugging</com:Name>
+        </str:Code>
+      </str:Codelist>
+    </str:Codelists>
+  </mes:Structures>
+</mes:Structure>