the mushroom worked well, i think on the older brada -- is that how you say it? >> brada. >> supervisor safai: i heard a life span of 100,000 miles versus 120,000. i know it is a mechanism that you just talked about. you'd have to ask the contractor, siemens to retrofit and change. what's the cost of that overall to the entire system to fix that defect that was not known before purchase? >> it's about 30,000 per vehicle and about $5 million to $6 million total. >> supervisor safai: so is that something you'll have to come back for approval or is that something you're asking the t.a. for? >> it's build into the package and prop k is one of the several funding sources that will go to address the overall replacement costs of these two. >> supervisor safai: so this was something that you would say based on the training of the operators because of what i heard you say about the whole emergency situations that people are safe, you taught them to hit the mushroom, and that's something that you've continued with the new system, the siemens? >> to clarify, we put a strong