I am excited to report that TRB has released the pre-publication of TCRP Research Report 235 Improving Access and Management of Public Transit ITS Data.
The report is here: https://www.trb.org/Main/Blurbs/182792.aspx
This is the product of TCRP Project G-18 and the results provide a great starting point for us to realize the TIDES vision of a fully developed open data format for historical transit operations data.
On the TIDES side, we are working hard to setup a repository for the TIDES community to build on this data format and associated tools. Stay tuned for more information on this in the very near future. In the meantime, take a look at the TCRP report. It's great work by the research team, panel, and TRB.