ASC electronic bells, also known to some signalfans as "white topped electronic bells "were first found to have existed in 2004, and can be found in some areas still in service.

Very little is known about this bell, including weight, voltage, operating temperatures, and so forth.

This bell has been heard in action, and sounds nearly identical to a General Signals electronic bell. It can produce tones very close to General Signals types 1 and 2.

It is louder sounding than a traditional General Signals electronic bell, and is likely to have its tone adjusted just like the General Signals electronic bell can. ^{(NOT VERIFIED)}