1b06a131__Census_1840___Social_Explorer__Column_18_2
[Column 18] laborer [Column 19] railroad [Column 19_3] steam railroad [Column 18_2] 
conductor
Census Questionnaires and Instructions: 1790 to 2000 - Measuring America: The Decennial Censuses From 1790 to 2000 - Survey Census 1840 - Social Explorer