According to http://www.trainzkuidindex.com/ the item is freeware from http://jointedrail.com
Apparently it's 52ft_bulkhead_log_loads_1 but there's nothing on their freeware page (maybe you have to log in), and both links from the kuid index lead to a "page not found".
Not sure what to make of any of that, but it's a reminder as to why I rarely download routes that use custom content that isn't on the DS.
Thanks I'll try both. I had suspected some type of wood but wasn't sure which.
EDIT: You do have to log in to see the content, but its indeed on the bulkhead flats page. 52 Ft. bulkhead Log Loads, its the second download link on that page.