These are available with coloured backgrounds (green or black as appropriate) as the default. Clear backgrounds are also available.

As a general rule, Waterslide Smokebox Numbers are included for un-named locomotives, but NOT for named locos, as they have etched smokebox number plates already on their nameplate fret. (There are some named locos which DO have Waterslide Numbers, but they are an exception to the rule - please don't email to ask which ones!) Class Sheets of Waterslide Smokebox Numbers for named locos will be available as separate items in the near future.