I am currently working on an unsolicited proposal for Metro. A key part of the proposal involves playing audio on the buses and rail cars. I need to find out some technical specs and other information on how the systems that announce the upcoming stops, etc. on the buses and rail cars function. I was told by someone in procurement that your department might have information on this or be able to direct me to somewhere else within Metro that can provide more insight. Please let me know if you would be able to provide any assistance.