From all the samples that I was able to find, the only ones that do not match are the ones in Coach "11", where this area contains "1". All the other barcodes match. I think this could correspond to the less significant digit, and that the most significant one might be encoded somewhere else. I don't think there is any train that has more that 19 coaches, therefore this digit could be encoded in just one bit. I have a candidate (30:4), this matches with all my samples, but I don't have enough 2-digits-coach ticket to validate this hypothesis. Also I could not understand the meaning of bit 30:5 (that would be between the most significant digit and the last one)