We're currently seeing issues with data coming from TFL for the Bakerloo line. TFL are working on a solution, but we don't have an ETA for the fix.
TFL
*Upcoming arrivals in the next 5 minutes. At certain times there may be minimal or no scheduled arrivals. Some lines don't run at night, off peak, or during engineering work. Shorter routes with less frequent trips may be running, but may not have any arrivals in the immediate future.
If there are no arrivals showing when there should be, then there may be an issue with data coming from the transit network.