The 25Hz transformers were removed when the line was converted to 60Hz approximately 32 years ago. Advances in metalugy and insulation material over those 32 years permit transformers of a specific given size to handle about 50% more power.
Cos cob is getting new transformers. Wonder if old ones were 25 Hz of old system ( which might have worked or 60 Hz ) . It may be that old ones did not have enough capacity ? Most transformers have a very long in service life. Just one more item that shows MNRR is open and trying to stay ahead of any past or future problems.
http://www.governor.ct.gov/malloy/cwp/view.asp?A=4010&Q=539158
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