# Data Dictionary - Locomotive

Description:
Scalar to indicate activity level (ton-miles) relative to 2011 activity


Description:
Scalar to indicate fuel efficiency (gallons/ton-mile) relative to 2011 activity


Description:
Fuel burned in the specific GAI during the specific calendar year


Description:
Definition of USEPA emission standards met by locomotive


Description:
(could also represent alternative technology, e.g. battery, fuel cell, etc.)


Description:
Share of locomotive activity represented by the tier


Description:
Fuel projected to be burned by each tier within each GAI


Description:
Pollutant being modeled (NOx, PM2_5, etc.)


Description:
Emission Factor (g/gallon), defined by USEPA for Tiers 0-4


Description:
Total emissions for the pollutant, measured in grams per year


Description:
Total emissions for the pollutant, measured in tons per day


Description:
Scalar adjustment factor to reflect emission impact of CARB diesel


Description:
Variable to specify PM pollutants affected by fuel sulfur content


Description:
Variable to specify SOx pollutants affected by fuel sulfur content


Description:
Emissions adjusted to reflect impact of CARB diesel (tons per day)


Description:
The sulfur content of the fuel modeled as in use during the calendar year


Description:
The sulfur content of the fuel used to meet USEPA tier definitions


Description:
Emissions adjusted for CARB diesel and fuel sulfur content (tons per day)


