Align F {RAIL,ROAD} output level w/ demand

Author: khaeru

message_ix_models/data/transport/technology.yaml

@@ -302,7 +302,7 @@ F RAIL:
   - f rail electr
   - f rail lightoil
   units: Gv km
-  output: {commodity: transport F RAIL vehicle}
+  output: {commodity: transport F RAIL vehicle, level: useful}
   iea-eweb-flow: [RAIL]
 
 crail_pub:
@@ -342,14 +342,14 @@ transport F RAIL usage:
   description: >-
     Conversion from vehicle-distance traveled to freight transport activity
   input: {commodity: transport F RAIL vehicle, level: useful}
-  output: {commodity: transport F RAIL}
+  output: {commodity: transport F RAIL, level: useful}
   units: tonne / vehicle
 
 transport F ROAD usage:
   description: >-
     Conversion from vehicle-distance traveled to freight transport activity
   input: {commodity: transport F ROAD vehicle, level: useful}
-  output: {commodity: transport F ROAD}
+  output: {commodity: transport F ROAD, level: useful}
   units: tonne / vehicle
 
 F usage:
@@ -455,7 +455,7 @@ F ROAD:
   - FR_ICG
   - FR_ICH
   units: Gv km
-  output: {commodity: transport F ROAD vehicle}
+  output: {commodity: transport F ROAD vehicle, level: useful}
   iea-eweb-flow: [ROAD]
 
 F:  # Freight modes