Count maximum times same number used in a row by criteria

Tricky one to explain, but example attached.

Is it possible to count the amount of times a number is used in succession?

For example if you have in column A the name of the location and Column B a serial number. Can you count the maximum amount of times the same serial number is used in succession for that location name.

I don't want the total count of the serial number just the maximum times the same one is used in a row

Sorry for the awful explanation, the example file should be clear though. Thank you for any help