Assuming your employer is in Oregon: If your employer withheld the Statewide Transit Individual (STI) tax from your wages, it should be reported in Box 14 of your W-2 using code "ORSTT W/H".
"In box 14 of your W-2:
1) For the lower $$ amount use the "Category" ORSTT W/H (the W/H actually stands for WithHolding)
2) For the larger amount... those are wages... select "Other not on above list"."
See Champ SteamTrain's original post HERE.