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i live in the DC area and am looking for railroad ties to build a small retention wall. any ideas where to look ? lumber yards don't have them.

I guess they tested on animals:6. Are railroad ties safe for me to use for landscaping around my home?
There are no approved uses of creosote to treat wood for residential use. The Agency is aware that creosote-treated railroad ties are being used in the residential setting for landscape purposes and, in some instances, as a border around gardens. Such uses in residential settings are not intended uses of creosote and have not been considered in the preliminary risk assessment
Animals fed large amounts of wood creosote had convulsions and died, while those fed lower levels had liver and kidney problems. Animal studies have shown that when pregnant animals breathe creosote, it may cause harmful effects to the baby.
These are being used as the base for a retaining wall by my drivewayDave, read this for your son:
G
University of Florida study released last year found that CCA-treated decks caused surface soil arsenic concentrations underneath the decks to be 2000% higher, on average, than normal.
You should NEVER use bleaches, deck cleaners or brighteners on old CCA-treated wood because they oxidize the chromium-3 that's already in CCA-treated lumber, turning it into the highly carcinogenic chromium-6.