Your railroad bell is most likely from a diesel-electric locomotive and most likely made by the Electro-Motive Division of General Motors Corporation, commonly referred to as “EMD.” General Motors Diesel, Ltd. From your photos, your bell needs a lot of restoration.
Do not let this bell die. Go local – find a guy like me that can polish your bell.
The blue paint pretty much ruined any historic value. You can restore it to “Show Condition”.
“Show Condition” is better than a bell painted blue.