Action is related to Slip. Slip is related to Walking. Walking is related to Ground. Ground is related to Railroad. 
you are likely to find Homeless in/at/on Bridge. Homeless is related to Poor. Poor is a synonym of Weak. Weak is a synonym of Delicate. 
Action <--RelatedTo--> Slip <--RelatedTo--> Walking <--RelatedTo--> Ground <--RelatedTo--> Railroad 
Bridge <--AtLocation-- Homeless <--RelatedTo--> Poor <--Synonym--> Weak <--Synonym--> Delicate 