You are looking for a small magnetic container.
You will be on a railway bridge overlooking the tracks so just for the fun of it... how many trains have gone past while you were searching & signing the log?
The pavement where the cache is hidden is quite narrow so please take care with the geo pets and geo kids. The road is also quite narrow in parts so if you're doing this as a drive by I'd recommend tucking those wing mirrors in and as always please be mindful of residents parking areas.
Please replace as found and report any issues with the cache