Those new EC numbers are perfect. When someone tells you the 155 is a 6 ton machine, you can easily say:" Wait a minute, what was the second 5 for ?"
Yes, the system works well until you get into double (weight) figures, then starts to go a bit awry - hence the 225 and 725 (by rights they should be the 1125 and 6125, but that spoils the 3 digit number convention!)