With Visa Electron bank account balance is checked before allowing a transaction to complete, but some (offline) payment systems may not be supported because verifying the availability of funds is not possible. Where I can expect to find Electron unsupported and can the coverage vary due to older infrastructure?
Is Visa Debit more widely supported than Visa Electron?
It seems yes, as Merchants would prefer to have Visa Debit as it allows for accounts to be overdrawn. As per wikipedia
Visa Electron is a debit card available across most of the world, with the exception of Canada, Australia, Ireland and the United States. The difference between Visa Electron and Visa Debit is that payments with Visa Electron require that all the funds be available at the time of transfer, i.e., Visa Electron card accounts may not normally be overdrawn. Visa Debit cards, on the other hand, typically allow transfers exceeding available funds up to a certain limit. Some online stores and all offline terminals (like on trains and aircraft) do not support Visa Electron because their systems cannot check for the availability of funds