Renumbering rolling stock?

As I look at all the model rolling stock out there, I wonder how people make fleets of things like tank cars so they can run a unit train.

What is the usual proceedure for remubering a large amount of cars? Paint over the numbers and start fresh with decals or transfers?

And what is the best way to only change a few cars? Say you have two of the same boxcars, and want to change one number on one. How do you match them? What if you can't find the right style numbers to apply?

In other words, what is the usual rebumbering proceedure for both small and large amounts of cars?

JD

Pretty much as a rule, don't number your identical cars with sequential numbers.

It's easy to renumber a car. Paint over the old digits you wish to replace (usually the last 2 or 3) and use decals.

Alternatively, and especially in a car you're going to weather, you can scratch the old number off with a chisel-tipped Xacto blade. Don't scratch too deep... you just want to be able to cover the old digits with new ones.

But what if you can't find lettering even remotely correct? Magazines make it sound like the worl will laugh if you don't get these types of things absolutely correct...

Cover the old number with a grafitti decal, then place a new number over that.