Hi, I’ve been researching this myself for some time now.
This earlier reply by JaBear is very useful - IMO it is very good.
Also this manufacturer’s website has absolutely stacks of info. on masses of Products that could make you completely rethink how you intend to model a Diesel Pad; RYSX Railyard Supply Co.
Especially the sections about ‘Tanks’ and ‘Equipment by System Type’.
See if you can spot recycled CSX 6525 GP40 in the ‘Treated and Non-Treated Water Systems Equipment’ section.
CSX 6525 GP40 Ex-B&O 3749 (Retired)
Paul.