UIC Train Check Digit Validator

How does the calculation work?

This tool calculates the check digit of railway numbers according to the UIC standard:

1. Take the last 6 digits of the given number.
2. Multiply digits alternately by 2 and 1, starting from the right.
3. If the result is two-digit, sum its digits.
4. Add all results together.
5. The check digit completes the sum to the nearest multiple of ten.